1) PIC16F84 stepper motor controller
              http://www.interq.or.jp/japan/se-inoue/e_step.htm
2) Schematics
            http://www.commlinx.com.au/schematics.htm
3) APRS veh. tracking s/m
             http://www.sbszoo.com

4) http://gpsinformation.net/
5) http://www.web-ee.com/Links/links.htm
6) http://www. allaboutcircuits.com
7) www.ieee.org