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Over time, log construction standardized. The shape is a quarter circle, or quadrant with a radius of 5 inches (130 mm) or 6 inches (150 mm), [1] and 0.5 inches (13 mm) thick. [1] The log-line attaches to the board with a bridle of three lines that connect to the vertex and to the two ends of the quadrant's arc.
In this way, it is analogous to an electronic car speedometer using pulses from an ABS sensor, but with a much cruder time/distance resolution – typically one pulse/display update per revolution, or as seldom as once every 2–3 seconds at low speed with a 26-inch (660 mm) wheel.
However, most GPS receivers can automatically derive velocity and direction from two or more position measurements. The disadvantage of this principle is that changes in speed or direction can only be computed with a delay, and that derived direction becomes inaccurate when the distance travelled between two position measurements drops below or ...
NMEA 2000, abbreviated to NMEA2k or N2K and standardized as IEC 61162-3, is a plug-and-play communications standard used for connecting marine sensors and display units within ships and boats. Communication runs at 250 kilobits-per-second and allows any sensor to talk to any display unit or other device compatible with NMEA 2000 protocols.
Raymarine is a manufacturer and major supplier of electronic equipment for marine use. The company targets both recreational and light commercial markets with their products, which include: GPS Chartplotters; VHF Radios; Digital Fishfinders / Sonar; Radar; Self-steering gear (Autohelm / Autopilot) Satellite television; Software
Navman F20. Established by Sir Peter Maire in 1986 as New Zealand-based Talon Technology, Navman (as the company became known in the 1990s) is a GPS systems company providing stand-alone GPS units, OEM GPS modules, GPS software for Palm handhelds and Pocket PCs, automotive navigation systems and navigation systems for use at sea.