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 Western Oregon | Someone please correct me if I got this wrong. I think all are using true north on line number 0. Difference comes on the second pass. One uses true north on every pass, so every line will hit the north pole, and one is perfectly parallel on every pass, so when you get to the north pole you will miss it by the width your guidance. Using magnetic north is to variable to be good for any guidance. 90 or 270 heading will be exactly the same for all brands as stated by cyclones. | |
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