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=== Check if your device requires SIM for GPS ===  
=== Check if your device requires SIM for GPS ===  
Keep in mind that for some (many?) devices, GPS only works when a sim card is inserted. Such information is hopefully available in your device's page.
Keep in mind that for some (many?) devices, GPS only works when a sim card is inserted. Such information is hopefully available in your device's page.
[[Category:Troubleshooting]]

Revision as of 13:15, 27 October 2023

This page is intended to help with troubleshooting GPS issues.

How to check if GPS works

Using ModemManager's CLI

mmcli -m any --location-get 

If you get no output, then you did not get a fix yet.

Using Satellite

Satellite is a nice GUI app for testing GPS connectivity live.

AGPS

Normally, information about which satellites are where to expect (satellite almanac of orbit) is retrieved from the GPS satellites themselves and that can take at least roughly 12 min with a good signal.

That's where A-GPS (assisted GPS) steps in, by downloading this data from the Internet instead.

Enabling GPS manually in ModemManager

(TODO - is this needed? For my device with working GPS support, these steps were not necessary - if you know more about it, please verify and update this section)

mmcli -m any --location-enable-gps-nmea

mmcli -m any --location-enable-gps-raw

GeoClue

Many apps (ie. osmin, Gnome Maps) use geoclue to gather location info. /usr/libexec/geoclue-2.0/demos/agent

Troubleshooting

Check if SIM card has carrier configuration for AGPS

The carrier config selected by ModemManager (mmcli -m any | grep 'carrier config') also contains configuration for A-GPS. Whether the config is complete in that regard can be checked with mmcli -m any --location-status as it should contain assistance servers. If not, you might experience not continuous and only infrequent GPS fixes and other problems regarding GPS.

(TODO - what can be done then? injecting AGPS data manually?)

See this comment thread for more details.

Check if your device requires SIM for GPS

Keep in mind that for some (many?) devices, GPS only works when a sim card is inserted. Such information is hopefully available in your device's page.