Originally Posted by
1979schwinn
Most GPS (phone and watch), update (talk to satellite), once every 5-6 seconds.
It appears the GPS receivers used in phones and most devices are 1 Hz.
Originally Posted by
1979schwinn
More accuracy would require a dedicated GPS device.
The accuracy of reasonably-priced handheld units (dedicated or not) doesn't seem to be much different. The chips might not be that different but the antennas might, in a few cases, be better for a dedicated device.
Originally Posted by
1979schwinn
Another note on longer runs, you are handed off to different satellites every 20 minutes.
This is the case for every GPS unit. This has no bearing on accuracy.
Originally Posted by
1979schwinn
I work with surveying grade GPS and we have to set up and wait the 20 minutes to reconfirm our accuracy, +- 0.00'
As far as I understand, the surveying grade GPSs don't really work while moving. It takes a while for any GPS device to "warm up".