Gene,
Accurate speed measured by the paddle wheel is boat speed relative to
the water, which moves with the current.
Accurate speed measured with the GPS is boat speed relative to a
fixed point.
Having both accurate measurements enables you to understand how the
currents are effecting your boat. Having one or the other, or
neither leaves you to rely on your own senses, which usually work
surprisingly well enough to get you by in most conditions. A few
exceptions are: when your senses won't work or they aren't sensitive
enough.
I like all this instrumentation. I wish for opportunities to reap
the benefits of all their capabilities.
Cheers,
Bob Thackery
--- In [EMAIL PROTECTED], [EMAIL PROTECTED] wrote:
> Does anyone have experience with the Navman 3100 series? Their
Repeat 3100 claims to take any NMEA stream as input and thus (to my
mind) could be used as a larger display to report the speed the GPS
is reading (and without a thru hull for the paddlewheel). Prices
seem very competitive too.
>
> Gene Freund
> (who will certainly be adding a depth meter to F28R #31 "Noumena")
>
>
> >
> >
> > We havethe ST60 Tridata, that has temp, knotmeter and depth. I
think
> > the depth is the most important, as we use the GPS for speed and
> > direction, however I would suggest having a mechanical lighted
> > compass on the bulkhead.
> >
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