This unit tracks better the the HGPS mainly because it has updated firmware to calculate the extra precision since SA was turned off.
Here is more detailed info.
Going through there website I found some nice documentation on the PINOUTS of the GPS card.
Using the pin outs, I made my own connection using a LM7805 for voltage regulation and MAX232 TTL to rs-232 voltage shifter. I used a 12F629 PIC to send the superstar an initialization string (see below source code):
(click for bigger view)
Source code to Superstar Starter:
PIC Simulator IDE's BASIC code.
StarView program provided by Novatel to initialize the receiver as well as set other configuration parameters.
Project Completed: 12-14-06