[time-nuts] T-bolt elevation error...

Dan Rae danrae at verizon.net
Sun Mar 30 11:22:14 EDT 2008


I think this may have been pointed out already but the altitude reported 
by the T'bolt is the WGS84 altitude, which is not at all  the same as 
the altitude on your USGS map.

If you look up WGS84 in wikipedia you will find a better explanation of 
that than I could ever give.

Some of the gps control programs will give both altitudes, but Tboltmon 
does not.  GPSLog does both I think...

In my case the real ASL altitude of my antenna is about 50 metres; the 
T'bolt says about 12, which is fine by me.  So long as it is happy :^)
dr




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