Gps Marine
Gps Marine
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 Garmin GPSMAP 76 Versatile Navigator w 12 channel GPS receiver w WAAS for Boats  US $79.99
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 RAM Mount Adapter f Garmin Marine Fixed Mount GPS RAM Mount RAM B 101 G2U US $23.99
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 RAM Mount Cradle f Garmin GPS 76 Series RAM Mount RAM HOL GA6U US $9.99
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 SI TEX GPS 90 MKII 18 Channel GPS Receiver with LORAN TD Conversio US $397.99
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 Garmin Waterproof Marine GPS Compass Wireless Color Chartplotter Navigator US $561.95
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 2 NORTHSTARE GPS AERO ANTENNA MARINE USE US $199.00
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 SI TEX GPS 95CPI GPS Plotter w Internal Antenna SI TEX GPS 95CPI US $388.99
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 SI TEX GPS 95CP Color LCD GPS WAAS Chartplotter SI TEX GPS 95CP US $422.99
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 Touchscreen CF 18 12Ghz Tablet ULTIMATE NAVIGATOR Chart Plotter GPS WIN Wifi BT US $975.00
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 RAM Mount Cradle f SPOT Satellite GPS Messenger RAM Mount RAM HOL SPO1U US $9.99
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 Lowrance GPS Antenna Mount Base Lowrance 113 88 US $22.99
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 ACR TerraFix 406 GPS Personal Locator Beacon EPIRB NEW in box with all manuals US $199.00
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 RAM Mount Cradle f Lowrance Endura Series GPS RAM Mount RAM HOL LO9U US $8.99
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 OtterBox 3250 Series Clear Waterproof Case OtterBox OTR3 3250S 01 C1OTR US $20.99
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 Garmin Colorado 400c GPS Handheld Navigation System 010 00622 61 US $399.00
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 SI TEX TRAWLPLOT 12 SD Color Chartplotter with WAAS Receiver US $2,351.99
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 GARMIN GPS CHARTPLOTTER MARINE 176C GPS WITH DATA CARD ATLANTIC CITY COAST LINE US $195.00
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 GPS PUCK ANTENNA WITH 19 FT WIRE GM 88K MARINE BOAT US $39.95
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 SeaKey Version 2 Complete System Brand New In Box US $225.00
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 Raymarine ST70 Multifuntion Display ST 70 US $400.00
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 Garmin OREGON 400c GPS Handheld Navigation System 010 00697 03 NEW SEALED US $329.00
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 HORIZON Intrepid GX1260S VHF Marine Radio US $81.00
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 Garmin Colorado 400i GPS Handheld Navigation System 010 00622 51 NEW SEALED US $399.00
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 GARMIN GPS MAP 182C RECEIVER NICE CONDITION NO RESERVE US $202.50
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 RAYMARINE RAYSTAR 125 E32042 GPS SENSOR ANTENNA WHITE MARINE BOAT US $149.95
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 Garmin GPS map 188 sounder US $200.00
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 Garmin GPSMAP 78 Handheld GPS US $428.49
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 Raymarine E7D Multi function Display US $1,400.00
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 GARMIN 010 00774 00 GPSMAP 546 MARINE GPS RECEIVER US $955.00
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 Raymarine E120 W Touchscreen Multifunction Display US $1,400.00
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 Garmin GPSMAP 78sc Handheld GPS US $666.54
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 Garmin GPSMAP 78s Handheld GPS US $595.12
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 Touchscreen CF 18 12Ghz ULTIMATE NAVIGATOR Tablet Chart Plotter GPS WIN Wifi BT US $995.00
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 GPS MARINE ANTENNA GPS BASE STATION ANTENNA BNC US $20.95
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 Navionics CF 91SN US All in one Marine US $100.00
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 Raymarine C90 W Multifunction Display pre loaded with USA Coastal Charts US $600.00
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 sitex gps chartplotter colormax 6 wass antenna US $499.00
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 White Lowrance LGC 4000 Marine GPS Receiver Antenna US $235.99
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 Garmin GPSMAP 421 4 Marine GPS Chart Plotter System US $409.99
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 RAYMARINE C80 US $305.00
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 NAVPOD PP5051 POWERPOD PRECUT RAYMARINE 8 C80 E80 ON DASH PP5051 US $350.00
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 INFRARED IR CAMERA4GARMIN GPS MAP 2370 nav 4212 5008 US $129.99
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 Black Garmin Marine GPS System Mount US $47.99
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 GlobalSat BR 355 SiRF III Water Proof GPS Receiver PS2 and Serial Port Connect US $58.40
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 Garmin GPSMAP 441S Marine GPS Chart Plotter W Sounder US $599.99
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 Standard Horizon CP390i Marine GPS Chartplotter C Map US $999.99
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 Garmin GPSMAP 740S Marine GPS Chart Plotter W Sounder US $1,499.99
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 Black Garmin A C PC Adapter 18 Pin US For GPS Unit US $64.99
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 electronics box wedge for Garmin marine GPS US $250.00
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 Garmin GPSMAP 541 Waterproof Marine Chart Plotter GPS US $699.99
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 FISHFINDER GARMIN 546 3 D GPS DUAL Frequency 0077400 US $792.20
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 Uniden MHS135DSC Marine Waterproof Handheld VHF GPS Radio W DSC Feat US $240.99
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 Black Lowrance LHR 80 Handheld VHF GPS Marine Radio US $230.99
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 Garmin GPSMAP 620 All In One Marine Automotive GPS 010 00696 00 US $805.05
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 Garmin GPSMAP 421S GPS Dual Frequency Combo US $629.21
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 Humminbird AS HHGPS Handheld GPS Connector Cable US $49.98
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 Garmin GPSMAP 76Cx Handheld GPS US $318.92
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 FISHFINDER GARMIN 541s GPS With dual frequency transducer 010 00762 01 US $715.00
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 SL80 Signet Marine Tri Data Speed Depth Temp Instrument Head w wire harness US $20.00
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 NEW Garmin GPSMAP 740S GPS Marine Chartplotter with Sounder Free US Shipping US $1,499.99
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 8 Marine External GPS Antenna Coax Ratchet Mnt 1655 US $28.78
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 GARMIN GPSMAP 421 GPS CHART PLOTTER US $399.17
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 NOAA NAVIGATION MARINE DIGITAL CHARTS GPS SOFTWARE DVD US $14.98
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 NOBELTEC ODYSSEY GPS NAVIGATION SOFTWARE US $426.55
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 Garmin GA 30 New Passive Marine GPS Antenna Replaces US $88.07
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 GARMIN GPSMAP 441 GPS CHART PLOTTER US $495.09
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 GARMIN GPSMAP421S COLOR SOUNDER GPS W TM TRANSDUCER US $504.63
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 MAGELLAN TRITON 300 HANDHELD GPS REFURB US $159.04
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 SIMRAD RS10U CLASS D VHF US $181.35
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 STANDARD ECLIPSE DSC BLACK CLASS D 25 WATT VHF US $138.55
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 GARMIN GPSMAP 541 GPS CHART PLOTTER US $688.82
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 Garmin GPSMAP 421 GPS Chartplotter 010 00764 00 US $479.06
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 NEW Garmin GA 29 GPS Antenna US $95.00
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 Garmin GPSMAP 431 GPS Chartplotter 010 00765 00 US $537.49
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 NOAA DIGITAL NAVIGATION CHARTS CHARTPLOTTER GPS SW US $19.95
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 GARMIN GPSMAP421S COLOR SOUNDER GPS W OUT TRANSDUCER US $436.96
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 Garmin GPSMAP 441 GPS Chartplotter 010 00766 00 US $595.91
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 MARINE GPS NAVIGATION SYSTEM CMSNAV 1000 US $1,408.10
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 Garmin GPSMAP 521 GPS Chartplotter 010 00760 00 US $712.73
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 MARINE GPS NAVIGATION SYSTEM CMSNAV 2000 US $1,511.41
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 GARMIN GPSMAP526S COLOR SOUNDER GPS WITHOUT TRANSDUCER US $921.32
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 NOAA Nautical Charts GPS Marine Navigation Software DVD US $69.99
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 NOBELTEC TRIDENT GPS NAVIGATION SOFTWARE US $1,187.50
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 Humminbird 385ci PORTABLE Marine GPS Chartplotter Fish Finder Combo US $491.59
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 MARINE SHIPS BOAT NAUTICAL NAVMAN GPS ANTENNA GPS 1240 1330 BRAND NEW PIECE US $200.00
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 MARINE GPS NAVIGATION SYSTEM CMSNAV 3000 US $1,666.75
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 Garmin GPSMAP 526 GPS Chartplotter 010 00772 00 US $946.43
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 Garmin Humminbird Lowrance Magellan Raymarine Eagle Marine GPS Chartplotter US $69.99
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 New GPSMAP® 76Cx Handheld GPS Americas Basemap US $248.88
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 boat marine electronics box fish finder gps stowage compartment center console US $129.99
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 Humminbird 958C Combo GPS Fishfinder Sounder w Transducer External Antenna US $1,138.10
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 MARINE GPS NAVIGATION SYSTEM CMSNAV 4000 US $1,791.08
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 Garmin GPSMAP 740 GPS Chartplotter 010 00835 02 US $1,399.99
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 Garmin GPSMAP 546 GPS Chartplotter 010 00774 00 US $1,063.28
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 INTERPHASE PILOT LORAN 2 GPS 12 VDC MARINE BOAT US $49.95
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 NOAA Nautical Charts GPS Marine Navigation Chartplotter US $69.99
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 Garmin GPS 17x HVS High Sensitivity Receiver US $238.04
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 Garmin GPS 17x NMEA 2000 High Sensitivity Receiver US $307.08
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 MARINE GPS NAVIGATION SYSTEM CMSNAV 4000 PLUS US $1,977.45
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 Apelco Marine Boat Handheld GPS15 GPS Unit US $49.99
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Outdoors Dan: Northern Minnesota hot spot for fishing (desmoinesregister)
Q. I make two trips a year to Canada, in June with my wife to Indian Lake near
Vermillion for walleye, and in September with a group of guys to a fly-in at
Savant Lake for walleye and lake trout. Both are fantastic trips.
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Garmin GPS Marine Chart Basics with the GPSMAP 5208
Synchronising NTP Servers to the GPS System by David Evans
The GPS system is a US military system to provide worldwide positioning information for navigational purposes. The system is maintained for the military by USNO, the United States Naval Observatory. The system is implemented by 24 orbiting satellites, each with precision timing references that are used to triangulate position. With the rise in low-cost GPS navigational equipment, cheap GPS Antennas and Receivers can provide a precise time and frequency reference for computer network synchronisation.
This article presents an introduction to using the GPS system for computer timing applications. It describes the equipment that can be utilised to provide a precise time resource for computers and computer networks.
All of the orbiting satellites have on-board precise timing references that can be utilised by time servers to provide accurate time. Each satellite continually broadcasts accurate time and positioning information. This information can be received by a GPS receiver and externally mounted Gps Antenna. The timing information received is referenced to UTC time. The system is a free to air service requiring no set-up or subscription fees.
Many Network Time Protocol (NTP) server systems utilise GPS time as an external timing reference to synchronise Windows, LINUX, UNIX and other operating systems and network infrastructures. GPS is an ideal time and frequency source because it can provide highly accurate time anywhere in the world using relatively cheap components.
Each GPS satellite transmits a very low-power radio signal at two frequencies; L1 and L2. L1 is the civilian frequency band transmitted at 1575 MHz, while L2 is used for military positioning purposes. The radio signal transmitted by each satellite can easily pass through material such as glass and plastics but are blocked more substantial materials used in buildings. The signals travel by line of sight. The ideal location for a Gps Antenna is on a rooftop with a good view of the sky.
The radio signals can be received by a low-cost Gps Antenna. The antenna is essentially a high gain amplifier, which is used to amplify and transmit the weak radio signals down a coax cable to a GPS receiver.
The cable length that can be utilised between a GPS antenna and receiver is critical. Cable distance is determined by the relative quality of cable utilised and the gain of the GPS antenna. High antenna gain and high quality coax allows for much longer cable runs.
GPS signal amplifiers can be fitted inline on the coax cable to boost the signal and increase cable length. GPS amplifiers are generally powered from the coax cable. The higher the amplification, or gain, provided by the antenna, the longer the cable length that can be utilised.
Roof-mounted antennas can be prone to lighting strikes or other voltage surges. A lightning strike up to a quarter of a mile away can damage electronic components. Therefore, it is recommended that a surge suppressor be fitted. Lightning or surge suppressors are installed inline on the GPS cable and redirect any surge to earth. Various types of surge suppressor are available, from gas discharge devices to solid-state multi-strike devices.
GPS receivers decode the received signal from the antenna and provide easily readable information in a serial format. Microsoft Windows, Linux and Unix PC's or NTP Time Servers can utilise the timing information from the receiver for synchronisation purposes. Many different GPS protocols are utilised, the most popular being NMEA. The NMEA protocol was developed by the National Marine Electronics Association. The protocol specifies a set of sentences that contain time and positioning information obtained by the GPS receiver. The sentences can be parsed by a PC or time server to obtain accurate time.
To summarise, the GPS system is an excellent source of precise time for NTP server systems or for synchronising stand-alone Windows, LINUX and UNIX PC's. By using relatively low-cost components, the Global Positioning System can provide time sensitive applications with precise timing information.
D. Evans is an experienced technical author in the telecommunications and network time synchronisation industries. Click here to find out more about GPS NTP Time Server and Windows Time Server systems.
Article Source: http://www.earticlesonline.com/Article/Synchronising-NTP-Servers-to-the-GPS-System/183398