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Groucho's Fact Hunt


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The difference between grid north on an ordance survey map, and magnetic north (where your compass points to) is roughly 2 degrees - although it differs across the UK. Failure to correct for this when taking a bearing in heavy weather would see you 35m out for every 1km walked.
 
The difference between grid north on an ordance survey map, and magnetic north (where your compass points to) is roughly 2 degrees - although it differs across the UK. Failure to correct for this when taking a bearing in heavy weather would see you 35m out for every 1km walked.

Not quite right. It is actually about 16-17 meters out. This is known as the 1 in 60 rule. For every 60 units traveled, then being displaced 1 unit to the side equals an angle of approximately 1 degree off course ie the Course Made Good has diverged from the Planned Track.

So 1000 meters / 60 = 16.66666666666666666666667 meters

Source: I am a marine navigation nerd (I know this rule in yards/Nautical miles, but it is a simple thing to convert to meters/km's)

Edit - Bah! I failed to take in account the error of 2 degrees. Your numbers just about right.
 


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