D
Dakota Jim Russell
Ron Johnson wrote: The Pres. signed the edict to remove dithering from the signal which makes regular GPS more equivalent to dGPS. SA(selective availability) is still alive and well. (also reported in latest Cruising World).Questions:How accurate is GPS now? From observations, it would appear that altitude on a G48 varies by only 30 feet rather than 300. And location varies by even less.But does anyone have an accurate answer <grin>.Also, what sea level is it referencing? It appears to be 20 to 30 feet above local charts.And finally, is GPS time exactly the same time as GMT time, or is there a variation between the two?Jim