On Mon, 22 Feb 2010 13:03:40 +1100, Greg Troxel <[email protected]> wrote:
> > John Smith <[email protected]> writes: > >> On 22 February 2010 06:10, Jochen Plumeyer <[email protected]> wrote: >>> Be aware of your time zone (and daylight savings timezone as well) of >>> your >>> camera, as GPX times are all in lon=0°/ Greenwich/ UTC/ Zulu time. >> >> Actually they are in GPS time, and have an offset in seconds from UTC >> embedded in the signal. > > Huh? I realize that GPS internally computes in GPS time (!= UTC, != > TAI), but I have never seen an actual device output a track log in GPS > time - it's always been UTC. The GPS/UTC time offset is sent as part of the almanac data. Effectively, if you have a position lock, time will be in UTC. Most GPS receivers can output the time before achieving a position lock. That might be UTC or it might be GPS time, depending on if the almanac has been received or not. -- Andrew _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
