North arrows showing both grid and magnetic north
I routinely produce maps that are used in the course of fieldwork. Is there any way to generate a north arrow (similar to what's on a USGS 7.5 min quad or military map) that indicates the deviation between grid north and magnetic north?
Mapping Center Answer:
You can either use PLTS for this, or you can compute the amount of magentic declination for your map's location and use that value to rotate a north arrow yourself. Here is a link to the NOAA magentic declination estimator:
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