The key to setting a compass heading on the surface is to point the compass in the intended direction of travel and match the index mark to the?

To set a compass heading accurately on the surface, the key is to point the compass in the direction you intend to travel and align the index mark with the north needle. The north needle of a compass is typically marked in red and is always designed to point towards magnetic north. By matching the index mark to the north needle, you establish a reference point that ensures you are heading in the desired direction according to the compass reading. This alignment is crucial for navigation, especially when diving or engaging in any outdoor activities where precise direction is needed. Ensuring this match allows for reliable travel direction and helps in maintaining awareness of your path relative to other navigational markers.