Thumbing the map
Top navigators use a technique known as "thumbing the map". This is holding the map so that your thumb is next to your current position. Then when you next look you can instantly focus in on the right place.
Folding the map means you can't easily refer to the map key anymore, so you're going to have to learn the colours and symbols used on orienteering maps.
- Skilling Up- Hints and Tips for Improvement #5, from QuOnicle 152, January 2014