On Fri, 4 Nov 2005, Jim Ray wrote:
i've got a potential project for a trucking company in new orleans that needs
to use gps to locate trucks and post data to a central web site. most of the
gps devices cater to folks that want to know where to go.
this is a recent development. The original gps's had an
interface (then serial) which talked the NEMA protocol (data
is in ASCII) giving lat/lon and anything else the GPS device
knew about. This was before LCD readouts etc. They also gave
time markers at 1 pps of comparable accuracy to the
satellites, enabling people at home to have near cesium
grade clocks (see the TAC - totally accurate clock - try
google). You had to select the gps - some added jitter to
the pulses because of bad design.
I would expect the default on a GPS is for it to be able to
cough up lat/lon on demand through an external link.
Joe
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Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!
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