[FADCA] ZIP

Wed, 11 Dec 2002 08:14:17 -0500

> -----Original Message-----
> From: Dave Calder [mailto:[email protected]]
> 
> For n4zkf FBB bbs HF + 145.01 + 145.05
> 
> 
> Zip 32118
> 
> 29 15.03N
> 81 01.33 W
> 
> And I just spent 30 minutes looking for "datum", there isn't one.

Where did you get the Lat/Lon data? If you got it off of a
GPS there is a setting for the datum somewhere in there. On
the Garmins, I think is is under the Navigation settings.

If it came from a map, most maps have the datum published
somewhere, you just have to dig around for it.

On GPS devices it is selectable, so if you are using a certain
mapping program, you look up the datum for that mapping program
and set the datum on the GPS to correspond to it. If the datums
are different you will have tracking errors, I have seen them
as much as 500 feet off.

It may not seem like much but it can sure toss a big wrench in
the works if you use the wrong datum.

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