Intergrate a GPS chip-set into your application? I have no idea what these cost (I was with a nationwide 2-way wireless data carrier when we bumped into these folks a couple of years ago): http://www.sirf.com/products-ss2t.html The chip set consists of the GSP2t highly integrated digital chip, GRF2i integrated RF receiver and the SiRFNav software. The two chips are packaged as 9mm 48- pin LQFP packages and require minimal external components thanks to their high level of integration. SiRFNav software is designed for easy porting to host systems. Extracted this bit from: http://www.sirf.com/downloads/collateral/press_releases/SiRFstarIIt%20Chip%2 0Product%20Insert.PDF APPLICATIONS The SiRFstarIIt is designed to be embedded into large volume applications that use multi-thread processors and real time operating systems. The SiRFstarIIt hardware can be added to the host motherboard within an area as small as two square centimeters, and with minimal increment in bill of material. RF Jim -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads