IVL GPS + GRASS

[J.R. Spidell]

Since my last request for help was a bit vague, I'll expand a bit..

I intend to implement an Intelegent Vehicle Location (IVL) system.
Basically, multiple mobile gps units will talk to the base station
(a PC running Linux/GRASS?).  The PC will take information from
an RF radio through its serial port.  This information will include
the position of each mobile unit, the satellites each mobile unit
is tracking, etc, etc and make the info available on the PC with
a map of the surrounding area.  As far as GRASS goes, all I need
it for is to display the map on the PC screen using DXF or Tiger files
and take the information from the serial port and display dots on
the screen indicating each of the mobile units.

Now that I have given a little more info, what pieces of GRASS (v.digit+?)
should I look at first?  GRASS is a large package and somewhat
intimidating... I just need to be pointed in the right direction
to begin...

thanx in advance for the info,
-jr-