Page 5 - Newsletter_April_2026
P. 5
4 systems in operation
GPS - US original most widely used - 24 satellites, usually see about 6 1973 US military
Galileo – European GLONASS – Russian BeiDou - China
Without adjustment for relativity position drifts by 10km per day!
4 satellites needed to fix position and correctly sync clocks.
Satnav calculates a good (not guaranteed to be best!) route to destination
