Fishfinder Fish Plotter
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 Lowrance HDS 10 Gen1 w Transducer and 4 Yr Warranty  US $1,699.00
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 Northstar M84 Multi Function Display with GPS Sonaronly head No Accessories US $780.00
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 Northstar 6000i 12 Multifunction Display GPS MAP AS IS NO POWER PARTS US $52.51
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 Lowrance HDS 10 HDS 8 HDS 7 HDS 5 HDS 5M HDS7M HDS8M HDS10M DVD 2011 US $585.00
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 Raymarine E120 GPS Receiver Excellent Condition US $1,000.00
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 Raymarine E120 GPS Receiver Good Condition US $900.00
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 LOWRANCE HDS10 US BACKGROUND FISHFINDER GPS RECEIVER HDS 10 US $899.99
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 LOWRANCE HDS8 INSIGHT USA FISHFINDER GPS RECEIVER HDS 8 US $660.00
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 Garmin GPSMAP 168 Sounder GPS Receiver chartplotter fishfinder US $171.50
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 LOWRANCE HDS5 US BACKGROUND FISHFINDER GPS RECEIVER HDS 5 US $299.99
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 Raymarine C80 GPS Receiver US $135.50
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 Garmin GPSMAP 168 Sounder GPS Receiver Head Only w Map Source CD FREE SHIPPING US $219.99
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 Lowrance HDS 5 Lake Insight Gen 1 US $300.00
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 Lowrance HDS 8 Basemap Gen 1 US $1,000.00
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 Lowrance HDS 5 GPS Receiver US $600.00
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 Garmin GPSMAP 172C GPS Receiver With Blue Chart Data Card US $129.50
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 Raymarine A65 GPS Receiver US $1,000.00
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 Garmin GPSMAP 546s BRAND NEW PN 010 00774 01 US $869.00
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 Lowrance HDS 10 Fishfinder Base US with 83 200 kHz Transducer 140 00 US $1,899.88
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 Raymarine E80 GPS Receiver US $700.00
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 LOWRANCE HDS7 INSIGHT USA FISHFINDER GPS RECEIVER HDS 7 US $454.99
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 Humminbird 385ci Combo W Internal Antenna 407680 1 US $355.48
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 Humminbird 787c2 GPS fishing system Transducer and GPS Speed Included US $650.00
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 Lowrance LMS 527C DF iGPS GPS Receiver US $615.00
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 Sun Shade Glare Shield Visor for Garmin Zumo 665 660 US $17.95
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 Lowrance HDS 8 INSIGHT USA 2 GENERATION 83 200 DUCER US $710.00
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 Garmin GPSMAP 420 GPS Receiver US $159.99
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 GARMIN GPSMAP 525 GPS Marine Navigation Chartplotter 010 00597 00 US $404.95
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 Garmin GPSMAP 531 GPS Receiver US $330.00
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 HUMMINBIRD FISHFINDER 597CI HD DI COMBO DOWN IMAGING COMBO 408120 1 US $720.15
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 Marine GPS ANTENNA for RAYMARINE RC 420 425 RC420 RC425 US $142.17
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 Humminbird 365i Combo W Internal Antenna 407670 1 US $278.99
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 Lowrance Hds 5 Base Us W o Ducer 140 32 US $520.99
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 GlareStomper 320 Sun Shade Visor for 43 47 and 5 GPS Screens US $17.95
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 Marine GPS RECEIVER for Raymarine Raystar RC530 RC520 120 112LP US $142.10
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 GARMIN GPSMAP 421S GPS CHART FISHFINDER COMBO WITH T M 010 00764 01 US $447.75
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 Standard Horizon CP190I 5 Internal GPS Chartplotter w Built In C Map Technology US $523.92
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 GARMIN GPSMAP 546 Marine GPS Navigator Chartplotter Fishfinder 010 00774 00 US $733.95
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 Marine GPS RECEIVER for Raymarine RL70CRC RC 630 E80 C70 US $142.17
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 Marine GPS RECEIVER for RAYMARINE RC 425 420 APELCO 560 DSC Radio US $142.17
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 NEW Lowrance HDS 8 GPS Receiver FISHFINDER GPS CHARTPLOTTER NO RESERVE US $999.99
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 Marine GPS RECEIVER for NAVMAN TRACKER PLOTTER US $142.17
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 Anti Glare Sun Visor for Lowrance Elite 4 Elite 4m Elite 4x Mark 4x DSI US $24.95
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 Marine GPS RECEIVER ANTENNA for RAYMARINE E120 GEONAV US $142.17
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 Sun Shade Glare Shield Visor for Garmin Zumo 550 500 US $16.95
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 Sun Shade Glare Shield Visor for Garmin Zumo 220 GPS US $16.95
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 GlareStomper 316 Sun Shade Visor for 35 GPS Screens US $16.95
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 Anti Glare Sun Visor for Lowrance HDS 5 HDS 5M HDS 5X US $24.95
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 MARINE GPS RECEIVER for RAYMARINE A50 A57 A70 A70D US $142.17
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 Marine GPS RECEIVER for RAYMARINE RL70 L760 RL755 RL80 US $142.17
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 RAYMARINE E80 MULTIFUNCTION GPS DISPLAY US $1,350.00
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 Large Flexi Fish Finder Chart Plotter Sun Visor Garmin US $20.52
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 Marine GPS RECEIVER for NASA Clipper AIS Radar Raymarine Navcentre 300 US $142.17
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 Marine GPS RECEIVER for M Tech m500 Raymarine 49e 25 DSC VHF Radio US $142.17
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 NEW Garmin GPSMAP 531 Marine Navigator 010 00761 00 US $520.26
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 GARMIN GPSMAP 541S GPS CHART FISHFINDER W O XDUCER 010 00762 02 US $662.94
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 Humminbird 365i Combo Marine Navigator 4 Grayscale Lcd 50 Channels 4076701 US $299.99
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 Humminbird 385ci Marine GPS Navigator 35 256Co US $405.81
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 RAYMARINE C90W MULTIFUNCTION DISPLAY PRELOADED US COASTAL E62111 US US $1,649.99
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 GARMIN GPSMAP 521S GPS CHART FISHFINDER W TM XDUCER 010 00760 01 US $665.92
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 Humminbird 385ci Marine GPS Navigator 35quot 256Colors 8 bit Mul US $412.54
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 Interphase U1 CHRT PRO Interphase Chart Master Pro Combo External Antenna Ki US $1,005.10
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 Interphase U1 BBFF DFN Interphase Black Box Fishfinder Kit US $311.02
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 GARMIN GPSMAP 421S GPS CHART FISHFINDER COMBO W O XDUCER 010 00764 02 US $408.70
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 HUMMINBIRD 385CI FISHFINDER CHARTPLOTTER GPS 407680 1 US $379.95
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 Standard Horizon CP590 12 GPS Chartplotter w Coastal Charts US $1,529.70
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 STANDARD HORIZON CP590 12 GPS PRELOADED WITH US CANADA AND US $2,999.98
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 SITEX TRAWLPLOT 12 12 SD LCD COLOR CHARTPLOTTER W WAAS US $2,499.00
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 Garmin GPSMAP 5208 GPS Receiver US $2,600.00
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 Furuno GP1920C GPS Receiver US $2,699.99
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 STANDARD HORIZON CP190I 5 INTERNAL WITH EXTERNAL CONN US $999.98
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 STANDARD CPV550 BLACK 12IN GPS CHARTPLOTTER W VHF US $3,833.31
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 GARMIN GPSMAP 541S GPS CHART FISHFINDER W TM XDUCER 010 00762 01 US $751.36
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 Eagle FishElite 640C Fishfinder GPS Reciever 200 kHz Sonar Mapping Depthfinder US $369.00
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 Hummingbird 407670 1 FISH FINDER 365I COMBO Kit US $323.99
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 GARMIN GPSMAP 536S GPS CHART FISHFINDER DUAL BEAM TM 010 00773 01 US $891.52
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 Raymarine A57D 57 Fishfinder Chartplotter Combo TM Transducer No Charts E62188 US $685.88
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 Standard Horizon CP590 12 GPS Chartplotter North American C Map charts US $1,539.99
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 Furuno GP1920C NT Furuno NavNet GP1920C NT vx2 Chartplotter C Map NT Kit US $2,942.40
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 Hummingbird 407680 1 FISH FINDER 385CI COMBO Kit US $428.44
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Marine Electronics
Autopilots The first self-steering gear was introduced in the 1920's to control model yachts but it was not until 1948 that the principle was applied to full scale yachts. Standing at the helm for lengthy periods, monitoring instruments and keeping a good look out can be very tiring. An autopilot relieves the helmsman from steering the correct course leaving him free to maintain a proper watch. The autopilot can be set to either steer a compass course or a course relative to the wind. A fluxgate compass or electronic wind indicator feeds information to a microprocessor which then makes the necessary rudder movements to return the vessel to it's required course. The mechanical power is applied to the rudder by either electric linear activators, hydraulic pumps or rotary drives. GPS/Chart plotters can be used to input navigational instructions to the autopilot.
Battery Chargers will keep batteries fully charged thereby extending their working life.
Chart Plotters Typically a chart plotter consists of an antenna, mounted high on the boat, to track GPS signals and a display unit sited either at the at the navigation station or the helm of the vessel. The vessels position is sent from the antenna to the display unit which in turn shows it graphically on the chart. The Chart itself will look similar to it's paper equivalent and show depth, land mass, navigational aids such as bouys and potential dangers in the form of wrecks and obstructions. The user can add way points to the chart and zoom in and out of the display. Chart plotters can be connected to drive an autopilot and/or send GPS data to a fish finder or radar. They can also interface with a laptop enabling complex passage planning to be done away from the boat and then entered into the chart plotter after arriving at the boat.
Magnetic Transmitting Compasses work like traditional compasses using magnets to determine the vessels orientation to the earth's magnetic field they then transmit the boats heading to an electronic display. They make steering easier than with conventional compasses because they display steadier headings and do not suffer from the "lag" that occurs when making a turn. They can interface with chart plotters, autopilots and radar. Fluxgate Compasses consist of two pieces of readily saturated magnetic material with coils wound round them in opposing directions. AC current is passed through the coils and the material is saturated in one direction and then the other. The earth's magnetic field affects slightly the time at which saturation occurs, earlier in one coil and later in the other. The difference is then calculated giving an output proportional to the earth's magnetic field. They are accurate to 0.1 of a degree. Their output can be displayed digitally to the helmsman or they can interface with autopilots, chart plotters and radar.
Echo Sounders work on the same principle as sonar. A transducer emits a narrow beam of high frequency sound. This is reflected by any solid objects and the time between transmission and receipt of the echo is measured. The speed of sound through water is know and so the range or distance to the sea bed can be calculated. That is then displayed in metres. Forward Looking Sonar (FLS) enables you to see the underwater hazards before you're actually on top of them. A typical range for a FLS is 150 metres.
An Emergency Position Indicating Radio Beacon (EPIRB) is a piece of equipment designed to float free of a vessel in distress. It then sends a radio signal that can be detected by Search and Rescue Satellite Aided Tracking (SARSAT) satellites. They relay a message to a ground station that in turn can instigate a search and rescue operation.
Fish Finders use the same technology as sonar. A narrow beam of high frequency sound is transmitted by a transducer, this is reflected by solid objects such as the sea bed. By developing this technology fishfinders provide displays that show where the fish are and they can differentiate between bait fish and larger species
Global Positioning System (GPS Receivers) - This system was originally designed for military purposes and is owned and operated by the United States Department of Defence. 24 satellites are arranged in a "birdcage" around the globe, they are positioned in such a way that at any place on the earth's surface a direct line of sight can be established to a minimum of 4 satellites. A fix is obtained by measuring accurately the distance between a satellite and the GPS receiver at a precise time. Because the exact position of the satellite is known, these distances provide position lines which are converted by a microprocessor within the GPS receiver to read outs of latitude and longitude.
The log is used to measure the boats speed through the water. A paddle wheel or impeller, mounted below the waterline is turned by the flow of water, this generates electrical impulses that are fed to a microprocessor that displays both speed and distance run.
Inverters - On most boats today you will find domestic equipment of one sort or another. For on board entertainment there are televisions and stereo systems. With the popularity of chart plotters comes the PC or laptop. Maintenance often requires the use of power tools. Liveaboards might have a washing machine, dishwasher or microwave. Can take 12v, 24v or 48v supply and convert it to a stable 110 v or 220v AC supply.
Navtex can perhaps best be described as a continuously updated telex service providing navigation and weather information within specified areas. An on board receiver, tuned to 518kHz, the worldwide Navtex frequency, if left turned on will either print out or display the latest massages sent from a local station. The service is available up to 400 miles from the coast.
Radar enables you to see what otherwise would be invisible. They offer greatest benefit at night and in fog or rain and are of particular value when close to shore or in busy shipping lanes. They consist of an antenna and a display. The antenna sends out a stream of RF energy which is reflected back off hard objects. When this energy is bounced back it is converted to a signal which displayed to the user. The antenna rotates every few seconds, the display continuously calculates the direction of the antenna and so a precise bearing to the target is calculated. The time is measured for the energy to be reflected and so the distance of the target is also displayed.
Satellite Phones consist of an antenna, a modem and a normal handset. They are powered by an iridium battery. Their range is anywhere covered by in Inmarsat Mini-M satellite. Voice, fax, email and data can be transmitted.
Satellite TV requires an antenna and of course a television. Reception is available within a "footprint" which is based on EIRP (Effective Isotropic Radiated Power) of a transmitting satellite. The EUTELSAT together with the two ASTRA satellites cover Europe. NILESAT and the two ARABSATs cover Africa and the Middle East. Good coverage is also available in North, Central and Southern America.
SSB Radio has a range of several thousand miles. You will need an FFC license, or the equivalent in whichever country you plan to operate it. Power consumption is a consideration. Up to 100 Watts may be required for transmission. SSB radio requires several items of equipment. A transceiver capable of SSB operation, An antenna, this must be 8 metres long and in practice most boats use a backstay or shroud for the purpose having fitted the necessary insulators. An antenna tuner matched to the transceiver model. If you want to send email you will also need and radio modem and computer.
VHF Radio The power required to transmit is minimal, all sets have the option of transmitting on either 1 Watt or 25 Watts and the lower power should be used whenever possible. Unlike telephones that allow you to both talk and hear at the same time most VHF sets require you to press a transmit button prior to talking. This is known as simplex. Duplex sets are available but are much more expensive. VHF radio waves travel in straight lines so the aerial should be mounted as high as possible, preferably at the masthead.
About the Author
Ken Jones runs a Sailing Site.
More information about marine electronics can be found here
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