Expedition Navigation Software 
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What does having a 'mast height' calibration source file do to other parameters in EXP?
Should I have it, not have it, have a single figure or use a table that has mast height above the water associated with the heel of the boat (ie more heel, less height - geometric).
Not sure?
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It is only used if calculating TWA and TWS to correct for motion.
So it wil never be used in most cases.
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Many thanks!
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Nick has also clarified the Mast Height in the Calibration table should be the Height of the sensor above the Boats centre of rotation, only matters for those of us that dont have instrument processors to give TWS and TWA