The whole idea is, I have several GPS units with no display and I wanted an easy way to see my position. I have the option with the HamHUD II to see this, but it uses up precious display space that I rather use to display some APRS related information instead. So, I need a way to take the NMEA data comming out and display it in a simple format that can be read easily while driving down the road. Link.
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An alternative to this design is the use of a OLIMEX AVR-MT-128 ATMEL 128 development board (available from http://www.sparkfun.com) coupled with the avrlib interface library. The development board integrates an RS232 port LCD display and five buttons. The Procyon AVRLIB (free at http://hubbard.engr.scu.edu/embedded/avr/avrlib/) incorporates RS232, LCD display driver, and GPS parsing routines (keep in mind that the development board RS232 is connected to the #1 port and not the #0 port). The free WINAVR development package may be used to program the system. It would seem that this approach would be simpler and more interactive.
That particular article is a little light on details, but the rest of the guy’s site is full of interesting things about amateur radio, packet radio, GPS and more.