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

Karl Magnacca kmagnacca at wesleyan.edu
Fri Mar 20 05:49:33 CDT 2009

On Fri, March 20, 2009 10:10 am, Finn N. Rasmussen wrote:
> Do the programs and gadget that transfer GPS-info to, e.g., cameras,
> also transfer information of the geodetic datum used when recording this
> particular set of coordinates?

The datum when recorded doesn't matter, since when the points are
downloaded they come in whatever datum is current (at least on mine they
do, I assume this is standard).  That allows you to get your points in
multiple datums (data?).  That is, it *shouldn't* matter; I would be
interested to know if there's an error introduced in converting from one
datum to another, or if it matters what datum it's set on when the point
was taken.  Although if there is an error, I'd be surprised if it's
greater than a small fraction of the point accuracy on a typical
hand-held unit without differential correction.

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

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