Robbin, I thank you for the info (even though my comprehension is limited -.. that is how I maintain a carefree lifestyle!) I will continue to sail in a freewheeling mode - my concern is more for my directionally challenged wife and my use of GPS for address location in the course of finding my next appointment for my work. Thanks for the info - Good to hear from someone who has a grip on the technology. I like the military-industrial spin-offs like GPS SOOO much better than that crappy tasting Tang and the stupid space pen! Thanks, GO