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> Do missile systems also lose track of their position midway through a flight like our phones? Civilian grade GPS receivers are intentionally crippled to stop
by sannee 9y ago
> Do missile systems also lose track of their position midway through a flight like our phones?
Civilian grade GPS receivers are intentionally crippled to stop working above some altitude/speed limits.
EDIT: It seems that the COCOM limits apply only after "1,900 km/h at an altitude higher than 18,000 m".
However, looking at the ublox receivers as an example, they have to be explicitly configured to operate at aircraft-level speeds, which smartphones likely aren't.
- isostatic 9y agoMy iphone has picked up gps signals on short flights on several offasions, I have an almost flawless track on a flight from LGA to DCA, and on over the Mediterranean from Frankfurt to Lagos. The LGA to DCA one had a max speed of 461mph (average 322) and altitude of 23,400 foot, with maximum negative gradient of 67.7%. Maximum speed I've recorded overall (I've had the app open for 24,190 miles) is 673.3mph, and max altitude of 35,081 ft
- elSidCampeador 9y agoYeah, mine too! I got a perfect signal while flying from Las Vegas to San Francisco.