Polar Electro V650 User Manual page 66

You can also change the map direction (HEADING UP or NORTH UP) by
tapping the map type indicator in the upper right-hand corner of the screen
HEADING UP: The location pointer remains pointed towards the top of the
screen regardless of the direction you're heading. When you turn, the map
view rotates accordingly, so that the location pointer remains pointed
towards the top of the screen. The HEADING UP map type indicator in the
upper right hand corner of the screen points north.
NORTH UP: The location pointer is centered. The orientation of the location
pointer changes as you turn, and points towards the top of the screen only
when you're heading north.
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