Hello
elephant wrote:little parenthesis on GPS accuracy:
some researchers, specialists in continental drift now use it to measure movements of the order of 5 cm / year
You will never have a great precision with a civil GPS military GPS have a system of correction to align with the random errors, made voluntarily to the satellites. to thwart a use that intended evils could use the system
some misiles work with great precision on the order of a meter.
Currently we could make a GPS landing if there was not this random error that the Americans control on their satellite,
To have more precision we combine a (Laurenc C) ancestor of GPS we used it for air navigation until the arrival of GPS originally it is transmitters installed on the Atlantic coast (Caribou name code) for the navigation of boats, in operation since the last war, they are still in operation, but more for a long time, the device sold connects with the GPS and reduces the error much, although the gps certain day it is precise repetitive in 50 meters and other times ...
civil aviation is warned when they make big mistakes or modifications, most pilots in the north rely on GPS
Andre