I picked up some of the GPS Receivers last week.  They are the Trimble
SVeeSix receivers.

Add an active antenna to the input, apply 5 volts, MAX232 level
converter for RS232 and you can talk to the unit.  Has an 8 pin
connector,  serial in, serial out, DGPS serial in, 5 volt, backup
power.  The serial in is at CMOS levels.   These units communicate using
TAIP not NMEA that all mapping programs use.  I'm working on a
conversion unit to convert TAIP to NMEA protocol.

These receivers normally sell for about $160.00.  They are used in a lot
of fleet application, i.e, delivery trucks, and are the units that
General Motors uses in the GPS moving map displays in Oldsmobiles.


Dave Pearson