Depends on if you want water speed or ground speed.  If you want ground
speed use a GPS.  If you want water speed use a paddlewheel.  You can
buy the paddle wheel speed indicators at any marine electronics stores.
 They have pulse outputs.  Some of the newer Airmar smart sensors have
direct NMEA outputs.  Airmar is also working on a smart sensor using a
correlation technique with no moving parts.  I have been bugging them
for the OEM version for over a year and they are still having problems
with it.

Mark Skeels wrote:

>Greetings, PICsters.
>
>How would you go about creating a device to measure and provide a real-time
>readout the speed of a canoe on a lake or a river? (using a PIC, of course?)
>(...or not...)  :-) Only thing I can think of is GPS, but perhaps sonar, or
>something?
>
>
>Mark Skeels
>Engineer
>Competition Electronics
>meskeels@earthlink.net
>
>Soli Deo Gloria!
>
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>

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