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 Ritchie SR-2 Venture Bulkhead Mount Sail Boat Compass w/Clinometer - Black US $158.36 
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 Marine Aqua Sea compass Caravan Truck Boat 4x4 white 11 US $.99
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 WEEMS & PLATH HAND BEARING COMPASS PHOTOLUMINESCENT LIGHTING 3009 MARINE US $90.00
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 Brass Tube Marine Pocket Compass Camping Hiking Campaining Navigation~Nautical US $8.99
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 Sea Marine Pivoting Compass Boat Caravan Truck White US $7.99
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 Sea Marine Pivoting Compass Boat Caravan Truck Black US $7.99
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 Nautical Camping Marine Hiking Brass Compass W/Box New US $29.99
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 2" Beautiful Brass Marine Pocket Compass Camping Hiking Campaining Navigational US $8.99
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 Ritchie HB-845 Helmsman Steel Boat Compass - Bracket Mount - Black US $331.40
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 New in Box Vintage RIchiesport X-10 Marine Compass US $34.99
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 Sea Marine Compass - Black Truck Boat Pivoting Caravan Boat/Caravan/Truck Mount US $8.95
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 VINTAGE YCM JAPAN BLACK HEAVY METAL GLOBE NAVIGATOR MARINE BOAT COMPASS US $65.00
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 Sea Pivoting Marine Compass Rowing Boat Truck Carvavan Camping Hiking White US $8.49
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 LED Sea Marine Pivoting WE Compass Boat Caravan Truck US $7.49
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 LED Sea Marine Pivoting Compass BK Boat Caravan Truck US $7.49
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 LED Sea Marine Pivoting Compass Boat Caravan Truck WH US $7.49
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 LED Sea Marine Pivoting Compass Boat Caravan Truck BLK US $7.49
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 Sea Marine Compass BOAT TRUCK CAR 12v LED Light BBK BIG US $13.99
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 Sea Marine Compass BOAT TRUCK CAR 12v LED Light BIG BKE US $13.99
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 Sea Marine Compass BOAT TRUCK CAR 12v LED Light BIG WT US $13.99
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 Sea Marine Compass BOAT TRUCK CAR 12v LED Light WE BIG US $13.99
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 Bracket-Mount Marine Compass Boat Caravan Truck - Black US $8.35
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 Weems & Plath Marine Navigation Professional Brass Pencil Compass US $62.47
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 NEW WEEMS & PLATH HAND BEARING COMPASS PHOTOLUMINESCENT LIGHTING 3009 MARINE US $119.98
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 Sea Marine Compass Boat Truck Caravan with Mount White US $8.21
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 Sea Marine Compass Boat Truck Caravan with Mount Black US $7.93
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 Sea Pivoting Marine Compass Boat Truck Carvavan map 20 US $6.99
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 70P In-Dash Marine Compass New US $104.01
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 58-Kayak Marine Compass New US $54.20
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 Ritchie X-10W-M Sport Compass Marine - White US $39.36
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 Weems & Plath Marine Navigation Compass Chart Weight (N US $51.07
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 2" Beautiful Shiny Brass Marine Pocket Compass Camping Hiking Campaining~New US $3.99
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 NEW Brunton Watersports Marine Dash Compass SALE US $94.95
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 RITCHIE X-10B-M SPORT COMPASS MARINE BLACK X-10B-M US $42.89
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 Sea Marine Compass Boat Truck Caravan with Mount White Free Shipping US $11.99
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 Sea Marine Compass Boat Truck Caravan with Mount Black Free Shipping US $11.99
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 Ritchie X-10B-M Sport Compass Marine - Black US $37.81
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 Sea Pivoting Marine Compass Boat Truck Carvavan car 293 US $6.99
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 AUTHENTIC MODELS Executive Nautical Compass Ship Boat Marine Reproduction US $28.95
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 AUTHENTIC MODELS Lewis & Clark Nautical Compass Ship Boat Marine Reproduction US $31.95
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 Mahogony Box.Brass inlaid,Marine compass.Germany.In excellent condition. US $225.00
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 Weems & Plath Marine Navigation Compass Chart Weight ( US $51.07
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 Weems and Plath Marine Navigation Hand Bearing Compass US $149.94
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 AUTHENTIC MODELS Bronze Lifeboat Compass Nautical Ship Boat Marine Reproduction US $74.95
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 Shoreline Marine Compass Large (Black) US $22.62
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 Brunton 70P In-Dash Marine Compass US $105.84
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 Fluorescent Easy-View Stick-On Automotive - Boat Compass US $5.00
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 HDE® Sea Marine Compass - Black US $17.43
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Marine Compass
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.
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.
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