When using the Tru-Nord, you get true north only without having to fret over declination - although there's nothing they can do about the wobble of the earth. I have a drawer full of the factory compensated Tru-Nords, each tagged by location. They're my work horses on all my major field projects.
That sounds like a heck of a lot of trouble just to avoid adding and subtracting. Especially since those compass cards are only marked with the cardinal and ordinal directions to begin with.
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