which USB GPS device should I buy?

[Lennart Sorensen]

On Mon, Jan 04, 2010 at 04:18:40PM -0600, tug williams wrote:
> Yup - something like hiking trails. Accuracy is more important than price.
> 
> The GPSCorrelate screenshot implies sub meter accuracy in altitude
> measurements, which would be perfect - I want to map a sizable chunk of
> land, but being able to know where each photo was taken would be worth
> the cost and effort.

One thing GPSs are NOT good at is altitude.  It was not designed to
provide that with any kind of accuracy.  If you get +/- 100m you are
doing well.  GPS is meant to provide position for latitude/longitude
not altitude.

This is why there are a number of hiking GPS units that have altimeters
built in to get altitude.  It is much more accurate than GPS will ever be.

-- 
Len Sorensen
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