The 'M' and 'T' on the ground track indicator represent Magnetic or True.
'M' (Magnetic): Displays when the aircraft is moving and located outside of polar regions (latitudes less than 63.5° and greater than -65°).
Ground Track indicator with an 'M' showing.
(Over Colorado)
'T' (True): Displays when stationary or moving within polar regions (latitudes greater than 63.5° or less than -65°).
Ground Track indicator with a 'T' showing at far north latitude.
(Over the Northwest Territories in Canada).
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