Android Question How to check if GPS is LOCKED to position i.e. has signal?

[adrianstanescu85]

Hello

I'd like to ask how to check whether the GPS has a locked position, i.e. it has a signal and accordingly it did find a position? This is not checking if the GPS is enabled, that's easily done by GPS1.Enabled is false/true, but in order to have a locked signal the GPS surely is enabled.

By all means, when this happens, the gps_locationchanged is fired but I may loose the signal, still keep those Lat and Long coordinates but they're no longer available if I lost the signal in the mean while and I ran away. So... how to check when a signal is locked?

Thank you!
Adrian

 

[Erel]

LocationChanged event will be raised as long as there is a fix.

You can also monitor the status with the GpsStatus event.

 

[adrianstanescu85]

Thank you! The GpsStatus returns a list of satellites, how can I use that to know if the gps position is determined or not?

Basically I need a boolean variable so that I may know when the GPS signal gets lost (for instance when entering a tunnel).

 

[Erel]

You can check GPSSatellite.UsedInFix. Though it will not be different than handling the LocationChanged event. The location changes all the time when there is a fix. So if it wasn't raised in more than x seconds you know that there is no fix.

 

[adrianstanescu85]

How many satellites does it take to be UsedInFix when a certain location is transmitted? I figure no less than 3. If so, counting how many satellites are used could return a more accurate boolean GPSsignal value.