Sunday, December8, 2019
Privacy Policy
L-36.com

Raymarine O Array Radar (hd Digital, Shd Digital, Hd Color, Shd Color) Installation Instructions 87087 4



Note:

This is the new page for displaying documents. It allows documents to display on devices without pdf viewers specifically mobile devices, a new Google requirement. Note also that some documents have blank pages. Just click on "Next Page" if that happens.
Previous Page    Next Page
Go to page number
Note: Page number may not agree with index page numbers


Previous Page    Next Page
Go to page number
Note: Page number may not agree with index page numbers

PDF to Text.
RaymarineHD Digital Rad and registered HSB RayTech Navigator Sail Pilot SeaTalk and Sportpilot are UK registered trademarks of Raymarine UK and Raymarine are UK registered trademarks of Raymarine Holdings Limited 45STV 60STV AST Autoadapt Auto AutoTrim Bidata G Series HDFI LifeTag Marine Intelligence Maxiview On Board Raychart Raynav Raystar ST40 ST60 Seaclutter Smart Route Tridata UniControl Hybridtouch and Waypoint Navigation are trademarks ofRaymarine UK LimitedAll other product names are trademarks or registered trademarks of their respective 2009 Raymarine UK Ltd All rights number 813182Date 07 1 Important Information 7Introduction 7Transmitted power density levels 7IMO and SOLAS 7Radar licensing 7FCC Notice Radar 8EMC conformance 8Product disposal 8Display compatibility 8Warranty registration 9Technical accuracy 9Chapter 2 Installation 1121 Planning 1222 Installation procedures 1823 Post installation procedures 25Chapter 3 Maintenance 2731 Safety 2832 Maintenance 2833 2934 Raymarine technical support 30Chapter 4 Technical specification 31 56 HD Digital Radome Users GuideChapter 1 Important Information Warning Radio Frequency Radiation Hazard Warning Product installation and The radar scanner transmits energy operation at microwave frequencies which can be harmful This product must be installed and operated in particularly to the eyes Do NOT look at the antenna accordance with the Raymarine instructions provided from close range Ensure personnel are clear of the Failure to do so could result in personal injury damage radome when the radar is turned on to your boat andor poor product performance It is recommended that the radar is installed out of range of personnel eg above head user guide describes how to install connect and maintain your Transmitted power density levelsHD Digital Radome Antenna The models covered are A power density level of 10 Wm2 is likely at distances of 1 m RD418HD 18 4 kW Digital Radome Antenna or less from the radome RD424HD 24 4 kW Digital Radome Antenna A power density level of 100 Wm2 does not occur at any pointWhen properly installed and operated the use of this radarconforms to IMO and SOLAS IEEE C951 2005 Standard for Safety Levels with respect to Human Exposure to Radio Frequency Fields The equipment described within this document is intended for use 3 kHz to 300 GHz on leisure marine boats and workboats not covered by International ICNIRP Guidelines 1998 International Commission on Maritime Organization IMO and Safety of Life at Sea SOLAS NonIonising Radiation Protection Guidelines for limiting Carriage Regulations exposure to timevarying electric magnetic and fields up to 300 GHz 1998The HD Digital Radome Antenna is designed and manufactured to Radar licensingmeet the rigorous demands of the marine environment Howeverit must be installed operated and maintained properly Please Installation and operation of this radar may be subject to read and follow the recommended procedures in this user licensing of the equipment operator or vessel You are stronglyguide advised to check with the requirements of the licensing authority ofImportant Information 7your national administration In case of any difficulties contact your Product disposallocal Raymarine dealer Dispose of this product in accordance with the WEEE Directive Warning High voltages This product contains high voltages Do NOT remove any covers or otherwise attempt to access internal The Waste Electrical and Electronic Equipment WEEE components unless specifically instructed in this Directive requires the recycling of waste electrical and electronic document equipment Whilst the WEEE Directive does not apply to some Raymarine products we support its policy and ask you to be aware of how to dispose of this product Warning Product installation and operation This product must be installed and operated in Display compatibility accordance with the Raymarine instructions provided Failure to do so could result in personal injury damage The HD Digital Radome Antenna can be connected to Raymarine to your boat andor poor product performance multifunction displays MFDs as follows Direct connection to ESeries and to wide screen versions of CSeries MFDsFCC Notice Radar Connection via a Raymarine SeaTalkhs switch toChanges or modifications to this equipment not expressly approved Wide screen versions of CSeries MFDsin writing by Raymarine Incorporated could violate compliance All versions of Eseries MFDswith FCC rules and void the operators authority to operate theequipment All versions of Gseries MFDs Note Some limitations of functionality in the above systems may occur depending on the software statusEMC equipment and accessories conform to the appropriate Display Compatibility EMC regulations for use in marine environment After fitting an HD Digital Radome Antenna ie before it is used you must ensure that any associated multifunction display MFDCorrect installation is required to ensure that EMC performance is is using the latest software versionnot compromised8 HD Digital Radome Users GuideTo check the MFD software version switch on the MFD and checkthe version number on the navigation warning screen Note that if ascanner is not connected the version number will only be displayedfor 10 secondsYou can download the latest MFD software from the at Information on how to use thedownload to update the MFD software is also available on theRaymarine website Additional support information is available fromRaymarine technical registrationTo register your HD Digital Radome Antenna ownership please takea few minutes to fill out the warranty registration card found in thebox or visit and register onlineIt is important that you register your product to receive full Your unit package includes a bar code label indicating theserial number of the unit You should stick this label to the cardTechnical accuracyTo the best of our knowledge the information in this document wascorrect at the time it was produced However Raymarine cannotaccept liability for any inaccuracies or omissions it may contain Inaddition our policy of continuous product improvement may without notice As a result Raymarine cannot for any differences between the product and this Information 910 HD Digital Radome Users GuideChapter 2 contents 21 Planning on page 12 22 Installation procedures on page 18 23 Post installation procedures on page 25Installation 1121 Planning The product is supplied from a separate battery from that used for engine start This is important to prevent erratic behavior Warning Product grounding and data loss which can occur if the engine start does not have a separate battery Before applying power to this product ensure it has Raymarine specified cables are used been correctly grounded in accordance with the instructions in this guide Cables are not cut or extended unless doing so is detailed in the installation manual Caution Do NOT connect to positive Note Where constraints on the installation prevent any of ground system the above always ensure the maximum possible separation between different items of electrical Do NOT connect this product to a equipment to provide the best conditions for EMC performance system throughout the installation guidelines Parts equipment and accessories conform to the appropriate Check that you have been supplied with the following Compatibility EMC regulations to interference between equipment and minimize theeffect such interference could have on the performance of installation is required to ensure that EMC performance isnot compromised Center Line of RadomeFor optimum EMC performance we recommend that wherever RadomeAntenna Drill 4 holes 10 mm diameter 18 and 24 275 mm Center Line of Radome 1415 mm Raymarine equipment and cables connected to it are M8 bolt x4 Spring Flat At least 1 m 3 ft from any equipment transmitting or cables washer x4 washer x4 233 mm carrying radio signals eg VHF radios cables and antennas Forward In the case of SSB radios the distance should be increased to 7 ft 2 m 18 or 24 Radome Mounting Template 3026136C Artwork Number 3032866B More than 2 m 7 ft from the path of a radar beam A radar Denso Paste Installation template beam can normally be assumed to spread 20 degrees above D116931 and below the radiating element12 HD Digital Radome Users GuideItems Required Dimensions 18 inch antenna 247 mm 97 in 3 mm drill bit 10 mm drill bit 346 mm 1362 in diameter 521 mm 205 in Drill Adhesive tape diameter 458 in 1165 mm 917 in 233 mm 13 mm socket Torque wrench D117061 275 mm 092 in 1415 mm 557 in 13Dimensions 24 inch antenna 247 mm 97 in 346 mm 1362 in diameter 652 mm 2567 in diameter 458 in 1165 mm 917 in 233 mm D117001 The antenna must also be mounted where it is Above head height 275 mm Easily accessible 108 in As near as possible to the boats centerline 1415 mm 557 in D116951 On a rigid and stable platform capable of securely supporting the antenna under seagoing conditions Clear of large objects such as the flybridge large engine stacks searchlights horns masts etcAntenna Position Clear of heat and fumesThe optimum height for the HD Digital Radome Antenna theantenna is a location that is high enough above the waterline to At least 1 m 33 ft from a magnetic compass or other antennaegive a long range lineofsight to the horizon but not so high as tobe adversely affected by the boats pitching and rolling Antenna Mounting Angle The radar beam from the HD Digital Radome Antenna is approximately 25 wide in the vertical direction to give good target detection even when your boat pitches and rolls14 HD Digital Radome Users Guide To power supply 125 To display To HD Digital Radome Antenna 125 D116961 The following digital cables are available D113591 Cable length Part numberAlways mount the HD Digital Radome Antenna so that the scannerrotates parallel to the water line 5 m 16 ft 5 in A55076DPlaning hull boats and some displacement hull boats adopt a higher 10 m 32ft 9 in ft A55077Dbow angle when the boat is at cruising speed so on these boatsit may be necessary to shim the rear of the HD Digital Radome 15 m 46 ft A55078DAntenna to compensate for the bow rise and ensure optimum 25 m A55079Dtarget detection The amount of shimming should be such thatwhen the bow rises at cruising speed the radar beam rotation is in The following extension cables are availablethe horizontal plane Extension length Part number 25 m 8 ft 2 in A92141D Forward 5 m 16 ft 5 in A55080D 10 m 32ft 9 in ft A55081D Wedge or washers Important Use only standard Raymarine cables Do NOT make D113601 your own cables for use with the HD Digital Radome AntennaCables Mast Mounting If the HD Digital Radome Antenna is mounted on a hollow mast theYou need a digital cable to connect both power and SeaTalkhs to cable may be run inside the mast for connection to the unitthe HD Digital Radome Antenna If you run the cable up a mast take the appropriate measures toInstallation 15 Prevent the cable chafing where it enters and exits the mast In a 24 V system protect the power supply with either a 5 A thermal breaker or an 8 A fuse Minimize electrical interference by Not running the cable near other electrical equipment Power cable lengths Not running the cable alongside power cables or antenna The total permitted lengths of power conductor run ie power cable cables for other equipment plus cable extension from the power source to the HD Digital Radome Antenna are Power requirement for 12 V systems 20 m 65 ftThe HD Digital Radome Antenna must be supplied with power by for 24 V systems 35 m 115 fteither a 12 V dc or a 24 V dc supply Do NOT connect to a 32 V If you want to connect to a 12 V power system but a total powersystem conductor run of more than 20 m is necessary the use of a suitableIf you are replacing an existing Radome scanner with an HD Digital voltage converter is recommended to convert the 12 V supplyRadome Antenna you must also replace any existing cable with the voltage to 24 V and thus enable you to extend the run up to 35 mappropriate digital cable as described in section 27 Cables We recommend using a converter with a minimum 200 W output capacityIf you connect to the power supply via an isolator switch theminimum switch rating is Grounding For a 12 V system 20 A These grounding requirements are applicable for Raymarine For a 24 V system 15 A equipment supplied with a separate drain wire or screen Caution Do NOT connect to positive The product power cable drain conductor screen must be ground system connected to a common ground point Do NOT connect this product to a It is recommended that the common ground point is a bonded system ground ie with the ground point connected to battery negative and situated as close as possible to the battery negative terminal If a bonded ground system is not possible a nonbonded RFPower Supply Protection ground may be usedThe power supply must be protected by a suitable thermal circuitbreaker or fuse fitted close to the power source The are the same for both 18 and 24 HD Digital RadomeAntennae and are as follows In a 12 V system protect the power supply with either a 10 A thermal breaker or a 15 A fuse16 HD Digital Radome Users GuideBonded ground system preferred Implementation If several items require grounding they may first be connected to a single local point eg within a switch panel with this point connected via a single conductor to the boats common ground The preferred minimum requirement for the path to ground bonded or nonbonded is via a flat tinned copper braid with a 30 A rating 14 inch or greater If this is not possible an equivalent stranded wire conductor maybe used rated as follows for runs of 1 m 3 ft use 6 mm2 10 AWG or greater for runs of 1 m 3 ft use 8 mm2 8 AWG or greater D117091 1 2 3 4 In any grounding system always keep the length of connecting braid or wires as short as possibleRF ground system alternative Important Do NOT connect this product to a power system References ISO1013313297 BMEA code of practice NMEA 0400 D117101 1 2 3 41 Power cable to product2 Drain screen3 Bonded preferred or nonbonded RF ground4 1722 Installation procedures Vie w from aboveUse the following procedures to install the HD Digital RadomeAntenna the antenna A A 66 8 6 32 r 30 3 be Mounting platform 1 Num Mounting the antenna 26 k or Artw 30 FO RW Connecting to your system A R te pla D m d Te ar rw e g m Fo tin do Ra n Post installation procedures ou of M e in rL e e om te m n do Ce ad Ra m m R of 3 23 e 4 in r ete r2 rL m m m es nte o dia 10 om Ce 18 s ad le R ho 24 Caution Mounting Bolts ll nd Dri a 4 8 1 141 275 5m mm m Do NOT screw the antenna mounting bolts into the 2 3 antenna base more than 25 mm 1 inch or damage to the antenna could occur If necessary use shims or extra washers to prevent this happening 1Mounting the AntennaUse a mounting location that 1 Tape template to mounting IMPORTANT platform Ensure is Is robust enough to support the HD Digital Radome Antenna 2 Drill 3 mm pilot holes in 4 positions adequately robust for this under seagoing conditions 3 Drill out the pilot holes to installation D117011 10 mmdiameter Meets the requirements described under Antenna Position 2 Place the HD Digital Radome Antenna in position If you areThen fitting it on a planing vessel shim the rear of the antenna so that1 Prepare the mounting platform as in the following illustration the beam points slightly down in the forward direction when the boat is at rest to compensate for the bow rising at cruising speed18 HD Digital Radome Users Guide 1 Mounting platform nonplaning boat FORWARD level install 2 D Mounting platform R FORWARD A planing boat typical W R planing angle shown FO D113611 D117021 Vie w from underneath3 Lightly coat the threads of the four mounting bolts with the Denso Paste provided 5 Tighten the bolts to a torque of 20 Nm 177 lbfinch4 Ensuring that the bolts do not enter the antenna base more than 25 mm 1 inch secure the antenna with the 4 bolts flat washers and spring washers provided as illustrated If necessary use Connecting appropriate shims or extra washers to limit the length of bolt When connecting your HD Digital Radome Antenna use the entering the antenna base instructions given here and also refer to the installation instructions for the multifunction display MFD to which you are 19Run the digital cable from the HD Digital Radome Antenna to the Where a cable passes through an exposed bulkhead or deckheadsignal and power connection points use a suitable watertight feedthrough Run the signal connector to the appropriate MFD Do NOT run cables near to engines or fluorescent lights Run the power cable to a suitable 12 V or 24 V connection point Always route data cables as far away as possible from on the boats power system We recommend connection is made at the boats power distribution panel wherever possible other equipment and cables high current carrying ac and dc power lines Caution Pulling cables antennae Do NOT use cords or ropes attached to cable connectors to pull cables through restricted Connecting antenna apertures eg as in bulkheads as this could Ensuring that the arrow on the digital cable connector is aligned cause damage to cables with the red triangular mark on the HD Digital Radome Antenna connector connect the digital cable to the connector on the HDRouting cables Digital Radome Antenna and fully handtighten Do NOT use aCables must be routed correctly to maximize performance and wrench or any other toolprolong cable life Do NOT bend cables excessively Wherever possible ensure a minimum bend radius of 100 mm Minimum bend Note If the antenna connector is disconnected after initial 200 mm 8 in installation we recommend that before reconnecting you lightly diameter coat the connector thread with Renolit Aqua 2 Calcium grease Minimum bend of cable 100 mm 4 in radius Connecting signal Referring to the connection information for the multifunction display MFD to which you are connecting and to the Typical systems Protect all cables from physical damage and exposure to heat diagrams given here connect the digital cable signal connector Use trunking or conduit where possible Do NOT run cables to the appropriate MFD through bilges or doorways or close to moving or hot objects Secure cables in place using tiewraps or lacing twine Coil any extra cable and tie it out of the way20 HD Digital Radome Users GuideTypical SystemsDirect connection to display HD Digital Radome display SeaTalkhs Crossover Coupler Power cable To 12V24V supply D116571 via thermal breaker or 21Connection to networked displays non Gseries display HD Digital Radome display hs Switch SeaTalk hs SeaTalk hs SeaTalk Power cable To 12V24V supply D116981 via thermal breaker or fuse22 HD Digital Radome Users to GSeries Display Monitor HD Digital Radome Network selector switch in UP position GPM 400 hs Switch SeaTalk hs SeaTalk hs SeaTalk Power cable To 12V24V supply D116991 via thermal breaker or 23Connecting power VE bar VE barWhen connecting power refer to the Planning section and Ensure that the total length of power cable will not exceed the Where possible connect individual items of maximum length as described under Power cable lengths equipment to individual circuit breakers Connect power only via the correct value thermal breaker or fuse Where this not possible use individual inline as described under Power Supply Protection fuses to provide the necessary protection Caution Do NOT connect to positive Circuit breaker ground system Do NOT connect this product to a the power cable part of the digital cable to either a 12 V or24 V dc supply as follows Fuse Fuse 163711 Red wire to the supply ve either at the output of the battery D1 isolator switch or at a dc distribution panel2 Black wire to battery negative3 Drain connection screen to the common ground point see a breakerWhere more than 1 piece of equipment shares a breaker you mustprovide protection for the individual circuits Eg by connecting aninline fuse for each power circuit24 HD Digital Radome Users Guide23 Post installation procedures change the default language settings 4 Ensure that all personnel are clear of the antenna then switchBefore using the product carry out the following to transmit mode Mechanical checks 5 Carry out the radar operations described in the relevant MFD Switch on and initial setup Owners Handbook and check that all functions appear to be satisfactory 6 Check the bearing alignment to ensure that targets checks at their correct bearing relative to the boats bow Adjust theBefore switching on the HD Digital Radome Antenna alignment as necessary 7 Check the display timing before using the system for navigation Ensure that All securing bolts are fully tightened and the appropriate Checking for interference mechanical locking washers are in place Post installation check All connections are securely made If you have installed any system aboard a boat or made other All connecting cables and wires are secured and protected as changes to the boats electronic systems radar VHF radio etc necessary you need to check before casting off that all electrical systems Ask your local Raymarine authorized installer to check the operate satisfactorily without any undue electrical interference installation in order to conform with Electro Magnetic Compatibility EMC regulations To do thisSwitch on initial setup 1 Ensuring it is safe to do so turn on all electronic systems aboard the boatUse the information given here in conjunction with the in your multifunction display MFD documentation to 2 Check that the electronic systems all operate on and to carry out the initial checks and setup tasks1 Press and hold down the power key of your MFD until the unit beeps The magnetron warmup sequence should then start When the warmup is complete the unit should enter standby mode2 Use the appropriate soft key on your MFD to power on the HD Digital Radome Antenna3 If necessary at the MFD adjust the MFD 2526 HD Digital Radome Users GuideChapter 3 Maintenance contents 31 Safety on page 28 32 Maintenance on page 28 33 on page 29 34 Raymarine technical support on page 30Maintenance 2731 Safety 32 Maintenance Warning Do not remove covers Once a year Do not remove any cover from this product There are 1 Remove one of the bolts and associated no user serviceable parts inside washers 2 Clean the bolt and washers Warning Switch off power 3 Use Denso paste to lightly regrease the bolt thread Before commencing any maintenance task switch off 4 Replace the bolt and associated washers all power to the product 5 Repeat steps 1 to 5 for all bolts 6 Tighten all bolts to a torque of 20 Nm 177 lbfinch Periodically carry out these other maintenance tasks Ensure the antenna is firmly attached to the mounting surface Check that the cable connections are in good condition and securely attached Examine all cables for signs of chafing cuts or other damage If the antenna connector shows any sign of corrosion 1 Disconnect it 2 Clean the connector 3 Lightly recoat the connector threads with Renolit Aqua 2 Calcium grease 4 Reconnect and handtighten the connection until it is secure28 HD Digital Radome Users Guide33 Symptom ActionThe information provides possible causes and If the HD Digital Radome Antenna iscorrective action required for common problems associated with connected to the multifunction displaymarine electronics installations MFD via a SeaTalkhs switch ensure thatAll Raymarine products are prior to packing and shipping subjected All relevant equipment is correctlyto comprehensive test and quality assurance programs However connected to the SeaTalkhs switchif you experience problems with the operation of your HD DigitalRadome Antenna this section will help you to diagnose and correct The SeaTalkhs switch power supply isproblems in order to restore normal operation satisfactoryIf after referring to this section you are still having problems with your The SeaTalkhs switch is in goodunit please contact Raymarine Technical Support for further advice condition SeaTalkhs cables are securely procedure and in good conditionUse the following table to identify problems and remedial actions Displayed bearing is different to Carry out the bearing alignment procedure the true bearing described in the installation guide for the Symptom Action relevant MFD No Data Source or No Scanner Ensure the digital cable is securely message on display connected at both ends and is in good condition Ensure power supply thermal breaker has not tripped or fuse has not blown If necessary reset breaker or replace fuse ONCE ONLY If breaker keeps tripping or fuse keeps blowing contact Raymarine technical support for assistance Ensure power supply maintains the correct voltage when the system is switched on Ensure all products in the system have the correct software Contact Raymarine technical support for 2934 Raymarine technical provides a comprehensive customer support service onthe world wide web through our worldwide dealer network and bytelephone help line If you are unable to resolve a problem pleaseuse any of these facilities to obtain additional helpWeb supportPlease visit the customer support area of our website contains Frequently Asked Questions servicing access to the Raymarine Technical Support Department anddetails of worldwide Raymarine supportIn the USA call1 603 881 5200 extension 2444In the UK Europe the Middle East or Far East call44 023 9271 4713Product informationIf you need to request service please have the following informationto hand Product name Product identity Serial number Software application versionYou can obtain this product information using the menus within yourproduct30 HD Digital Radome Users GuideChapter 4 Technical Approvals Certification USA 47CFR FCC Part 2 Part 80 Certificate of Approval Canada RSS138 Iss 1 Technical Acceptance Certificate European Union EFTA R TTE Directive 199905EC Certificate of Opinion AustraliaNew Zealand ACMA Declaration of Conformity Compliance level 3General Dimensions 18 in antenna RD418HD 521 mm x 247 mm 205 in x 97 in 24 in antenna RD424HD 652 mm x 247 mm 2567 in x 97 in Weight 18 in antenna RD418HD 95 kg 21 lbs 24 in antenna RD424HD 10 kg 22 lbs Supply voltage Either 12 V dc or 24 V dc nominal Minimum108 V Maximum 33 V Power consumption 60 W 25 W standby Environmental Waterproof to IPX6 Operating temperature range 10C to 55C Humidity Up to 95 at 35C Maximum wind speed 100 kts Maximum range scale 48 Nautical miles NmTechnical specification 31Transmitter Type Solidstate modulator driving magnetron Transmit frequency 9405 MHz 25 MHz Peak power output 4 kW Duplexer Circulator Standby mode Magnetron heater ON Magnetron control ON All other services OFF Range Nm Expanded range Nm Pulse width ns PRF 18 14 75 3 kHz 12 100 3 kHz 34 18 14 150 3 kHz 12 200 3 kHz 112 34 330 2 kHz 3 430 15 kHz 112 520 13 kHz 6 12 24 48 3 6 12 24 48 900 820 HzAntenna Type Patch array Beamwidth nominal Horizontal 49 18 in antenna 39 24 in antenna Vertical 2532 HD Digital Radome Users Guide Polarization Horizontal Rotation speed 24 rpm nominal 48 rpm with compatible Intermediate frequency 70 MHz Receiver characteristic Linear Receiver noise Less than 5 dB including low noise converter and IF amplifier Bandwidth Matched digital filter for each pulse specification 3334 HD Digital Radome Users

Ad by Google

Cookie Policy:
This webiste uses cookies to save your settings. No personal information is saved. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. I do not keep site logs longer than I need to to keep bad actors off the site. Basically, I delete them after looking at them. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.