It is important to get the correct compass weighting. There are 5 to choose from - North, the two tropics, equator and South. I encountered a bunch of marines in Antarctica with the same compasses that they had been using on Woodbury Common - they wondered wht the needle was burying itself.... I am sure they were good at the 'fighting thing' though
WRT grid magnetic angle, there are a few resources on line that will calculate it for you - google is your friend.
See the map on this link
As Drew Parsons says, the magnetic declination in the Himalayas is effectively zero.
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