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Old 10-05-2008, 05:36 PM
Senior Member
Join Date: Sep 2007
Location: Palm Bay, FL
Posts: 260
Default Re: Furono plotter to yamaha speed gauge

Most NMEA sentences are explicit about what units of measure they're outputting speed in, with some sentences providing the units of measure in them (e.g. knots, meters/s or km/h). Unless the Yammy firmware writer was a total dummy, he should be making the conversion. So at 30 kts, the speed gauge should be showing 34/35 mph. If not, then it sounds like your suspicion may be correct.
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