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We used to remember this as follows:
"Grid to mag add"
"Mag to grid, get rid"
So, going from the map bearing of say 240 deg, we would add the magnetic deviation (usually written on the map with the date and rate of change) and set the compass accordingly.
If plotting from the compass to the map, we would subtract the mag dev from the compass bearing to enter it on the map.
At least I think that's what we used to do in the days of my hill walking in the UK.
Cheers
Dennis
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