Last satellite in the Indian Regional Navigation Satellite System launched

Re:Last satellite in the Indian Regional Navigation Satellit... by sannee on Friday April 13, 2018 @07:45AM (#16829020)

> 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.

[ Parent | on HN ]

Re:Last satellite in the Indian Regional Navigation Satellit... by isostatic on Friday April 13, 2018 @11:17AM (#16830762)

My 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

[ Parent | on HN ]

Re:Last satellite in the Indian Regional Navigation Satellit... by elSidCampeador on Friday April 13, 2018 @11:37AM (#16830992)

Yeah, mine too! I got a perfect signal while flying from Las Vegas to San Francisco.

[ Parent | on HN ]