Navman SPEED 2100. An accurate multi-functional instrument that displays speed, distance and water temperature. Speed can be calibrated easily over a measured distance and is fully adjustable from the front keys. Calibration parameters are stored in nonvolatile memory and retained even when power is turned off. Speed: 0 to 50 knots or 0 to 93 km/h or 0 to 58 mph (varies according to transducer used), resolution 0.1 up to 19.9 knots and then 20 and up. Trip and total log: 0 to 999 units, resolution 0.00 to 9.99 then 0.1 to 99.9, then 100 to 999, Water temperature displays from 0.0 to 38 degrees C (32.0 to 99.9 degrees F) in 0.1 steps, Speed or distance calibration, Units in knots, mph or km/h.