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Why are GPS-based subtitles sometimes missing or displayed as dashes or negative values?

If the mobile device does not have a GPS lock when video recording is started, all GPS-based subtitles will be excluded from display until the first GPS data packet is received during that video recording.

If the mobile device loses GPS signal for a few seconds, the subtitles will indicate this with dashes.  Some iOS devices can report negative values from their GPS when signal is intermittent or quality is low.