sumps

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@inspirity yes Digital Yacht’s HSC100 is a good example and it is purely a magnetic calibration no use of COG is made.

![image](https://cloud.githubusercontent.com/assets/10165637/23307306/ed3da562-fa9e-11e6-8bc5-daec3a7cf33c.png)

A light hearted set of "Old English Sea Dog" Units would be: Boatspeed - Knots Distance - Cables Temperature - Fahrenheit Wind Speed - Beaufort Depth - Fathoms Engine Pressure...