Originally Posted By: wildman800
For maps, I highlight important info, make notes in the margins. I try to minimize writing on the maps, except for my routes of intended travel, notated with the magnetic compass courses, adjusted for Variation.

For Nautical Charts, I do the above listed items but, I also use a green highlighter to mark all water that is too shallow for my vessel.

For Aviation Charts, I will sometimes connect the electrical towers, thus showing where the electrical lines are actually running.


I also add notes about prominent landmarks or obstacles if they are not on the map, and highlight the best landmarks that are on the map.
I have seen street maps that didn't mark a building that you could see from more than 3/4 of the city, and cliffs that were to small to appear between the contour lines on topos.

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May set off to explore without any sense of direction or how to return.