Middlesex County, Ontario | All GPS systems use true north, they don't use magnetic North.
The difference is in the projections. A 0 degree John Deere line will cross the center of the North Pole, so will the passes beside it. Your passes might b 30' apart here, but they'll overlap completely if you drive to the North Pole. AgLeader/Trimble/Everyone else doesn't do it that way.
You can set your deere straight track to use different calculations. It's set to Deere by default, set it to non-john deere 2 to match AgLeader/Trimble exactly.
 (Capture (full).JPG)
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 Capture (full).JPG (95KB - 52 downloads)
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True North and Magnetic North in the same field
