Subject: Topozone Discrepancies<br/>
Date: May 15, 2001 @ 14:15<br/>
Author: bjbutler@bjbsoftware.com (bjbutler@...)<br/>
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<div id="ygrps-yiv-766200983">Anyone using www.topozone.com to acquire GPS coordinates should be <br/>
aware that they are using a mixture of NAD27 and NAD83 UTM <br/>
coordinates, but there is no way to tell which is which.  They <br/>
believe all coordinates are NAD27.  However, last week I relied on <br/>
this misinformation during a bushwhack from the Delaware Arc monument <br/>
to the Delaware - Maryland - Pennsylvania tri-point and ended up in a <br/>
hay field 200 meters north of the tri-state monument.  Using the same <br/>
target coordinates, but interpreting them using the NAD83 datum <br/>
yields the correct result.<br/>
<br/>
I have contacted topozone about this problem.<br/>
<br/>
Regards,<br/>
BJB</div>