[alberg30] GPS mount

[Guy Lalonde]

From: Guy Lalonde <lalondegc at videotron.ca>

Saunders,

­>Apart from telling me how to find my way in the fog (at least of the
atmospheric kind) they note that the unit can serve as a >knotmeter, which
would be nice when trying different sail trims.


Not sure about accuracy of a GPS as a knotmeter because of Selective
Availability (SA). And the displayed speed between 2 positions would assume
you sailed between those 2 positions in a straight line which may not always
be the case.

But if you only need to know approx speed, then what the hell.

A real knotmeter will give you speed on the water whereas the gps will give
you speed made good between 2 points. I could be way off here and would
appreciate any body confirming or correcting me on this.

My 2 cents.

Guy
#466
----- Original Message -----
From: <rap1208 at aol.com>
To: <alberg30 at onelist.com>
Sent: Saturday, February 26, 2000 10:38 AM
Subject: Re: [alberg30] GPS mount


> From: rap1208 at aol.com
>
> Saunders, Just some imput about the gps, A frien of mine made a swing away
> mounting, for a loran.   a friend of mind made a mounting for a loran. It
is
> mounted to the bulkhead above the stove, and swings out into the
companionway
> for readings.  You mignt want some sort of locking device, (perhaps a
shock
> cord) to hold it there.
>
> You can get a small hand held, like a Magellen 310 for about a $100 that
can
> be   used in the cockpit, and store in a small holder, or on the shelf
above
> the ice chest
>
> Also, you can't always expect pin point accuracy, like a loran,  so use
> caution , especially in fog.  My LORAN will bring me back within 30 ft of
the
> waypoint I entered at  that location.  It's done it time after time, and I
> trust it more for close in location work thatn I do either of my hand held
> GPS units  (Magelleon, and Garmin)
> good units, but in really bad fog, I'd trust the loran, if I can get a
signal.
>  Just my opinion,
> Russ  #251
>
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