[Taxacom] GPS units that record the time a waypoint was taken, accuracy, datum

Karl Magnacca kmagnacca at wesleyan.edu
Mon Mar 23 10:02:48 CDT 2009

On Mon, March 23, 2009 2:35 pm, Curtis Clark wrote:
> If your unit records in datum A, but you assume in all further work
> with the coordinates that they were recorded instead in datum B,
> wouldn't your results always be off?

Only if you're hand-writing the coordinates; otherwise, the unit
displays and downloads all points in whatever datum it's currently set
for (at least mine does, I assume that they all do).  Obviously there
are still ways to screw it up (e.g. by not paying attention to what
datum is set when you're downloading different batches of points, or by
thinking you're using a different datum from what you are), but the
point was that the datum that's set when you actually push the button to
mark a waypoint isn't important.

Karl Magnacca
Postdoctoral Researcher
Department of Zoology
Trinity College, Dublin 2

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