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I use an android app called GPS Status. Free App (with paid option).
The free app gives Magnetic north/south, True north/south, Pitch (1 Deg), Roll (1 Deg), Heading, Orientation, Magnetic Field Strength (uT), Acceleration, and Brightness (Lux).
It also downloads assisted GPS data, to help get a quick fix.
EDIT: No affiliation at all with this app, except for usage.
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