Jeffry J. Brickley wrote:
The other issue is the way data is stored for roads and addresses. There is no direct correlation between latitude/longitude data and road data except at key-points (roads are stored as vectors of direction and length which tends to increase errors until another key-point). Although many of us complain over the inaccuracies, since the primary user of said data is road navigation, and GPS navigation devices use "lock-on-road" options, most people don't know, and don't care. Welcome to the real world. congratulations on seeing it, most people don't.
I would like to thank you, I just thought I was getting a little more blind. LOL :laugh: No actually I understand what you are talking about due to the fact that I was a USCG licensed Oceans Master for 20 Yr. and we fought with the DMA for the same reasons, as we were more heavily relying on Loran (long ago), and then GPS (in my industry we also used the differental correction module). This really pointed out the difference between chart and reality. Anyway, thanks for pointing that out, as you obviously, know a lot more about the reasons for the errors than I do but it sure clarified allot of unanswered questions for me. :-D
DB_Cooper1950 Either enjoy life, Or Hate Life, Just quit SITTING ON THE FENCE!