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Thread: INS at High Latitude
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Old 18th Aug 2010, 08:45
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TopBunk
 
Join Date: Dec 2000
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I think you are confused.

An IRS/INSs' native mode is referenced to True North to start with. When it is switched to Magnetic, it accesses a look-up table of variation by Lat/Long and applies the variation to derive a Magnetic value.

So, when you switch to True, it just uses the native heading value direct.

What has variation got to do with True mode?
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