On Sun, 4 Jan 2009 16:18:07 -0500 "Sean Breheny" wrote: > Any thoughts? And, just to make the list of observations longer, GPS algorithms are optimized for the application intended for. So a cheap GPS module is software optimized for such things as max 3 G, maybe 300 km/h max., and a certain max altitude, too. This is mainly done to enhance precision, and getting processing speed into the range of the GPS processor capacity. I don't think you'll have destructive problems over 4G (till at least 20G), but the results will be trailing the actual result because of the slow digital filters. Results may go either way, depending on the filter types. John -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist