Test seems to show that WiFi contributes to GPS instability. But test incomplete because it was ruined by complete lock up of GPS logging for 8 hours!
On my phone a (Motorola G7) I had seen significant noise in GPS measurements when indoors, but not so much outdoors.
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I will perform anotehr static test with WiFi enabled again later, for comparison/
Key learnings
Wi-Fi does appear to have an impact on the noisiness of GPS data. WIth WiFi off, a stable phone appears to have a stable GPS signal. Since we cannot ask our users to disable Wi-Fi, I don’t know whether this is an actionable insight. Before taking any action based on this, we should run more tests, in a variety of situations, and with a number of different phones, to further test this hypothesis.
GPS logging lock-ups continue to be a major problem, and can occur even in the most benign conditions (unhandled phone, stationary, with WiFi disabled.
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