Walker 7070 Log is a Wheelmarked Speed Log System providing electromagnetic log data from a single processor. This compact, cost effective system takes advantage of ?state of the art? electronics to process the log sensor input, outputting digital data on a single NMEA 0183 data bus to DIN 144 data displays. The Walker 7070 electromagnetic log is designed for vessels above 500GRT, offering both forward and astern speed, with ranges from -0 to 80 knots full scale. It is suitable for vessels varying from patrol boats and ferries to liners and bulk carriers and can be offered with a fixed or retractable sensor.