On 1 February 2010 12:42, John F. Eldredge <[email protected]> wrote: > It may be difficult to obtain GPS equipment that has accurate altitude data. > The GPS satellite system is maintained by the US military, and I have read > that the altitude information available to civilian equipment has deliberate > errors, in order to make it harder for terrorists, or non-US militaries, to > use that equipment to plan out artillery attacks in advance. The equipment > used by the US military makes use of a more accurate, but encrypted, altitude > signal. In the US, at least, such equipment is classified and not legally > available to civilians.
Long term people will work out a way round the altitude problem if the need is great enough, just like they worked round the horizontal accuracy problem, even prior to SA being turned off people had a solution for over coming SA errors, which may have lead to SA being turned off earlier than originally planned. _______________________________________________ Tagging mailing list [email protected] http://lists.openstreetmap.org/listinfo/tagging
