The heading on my ST70 reads magnetic, but when I power up my E90 chart plotter the heading changes to True. The set up options on the E90 are set for magnetic and the readings on the E90 are magnetic. But the autopilot continues to read True. If I power down the E90 it still reads true. But if I power it down and restart--with E90 off--the autopilot reverts to magnetic. What's going on?
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