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post #8 of Old 11-19-2013
MarkSF
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Re: What GPS to use

The GPS will give you COG and SOG, but if you want speed through the water, you'll need a knotlog/paddle. If they are both nmea2000, you can use the plotter to display the speed from the paddle.

In fact if you buy a DST800, it'll give you speed and depth. Another $250 though.

Bristol 31.1, San Francisco Bay
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