When taking kids of the untrustworthy kind on forced excursions, we would cut the edges off the maps including any roads or dwellings. Eliminated a lot of run-aways.

I like to draw in the UTM lines on frequently used maps to make it easy to find coordinates when the GPS map is questionable or effected by overhead obstacles.

I found that easier to measure than using lat lon coordinates. Also to communicate easily over the radio sometimes we just used 3 north /south and 3 west/east numbers from the UTM.

I wish they still sold USGS maps locally.