Terrain One describes terrain which meets any of the following criteria:
is below 800 metres but more than 500 metres above sea level or;
is more than 30 minutes but less than three hours travelling time from a road which can take an ordinary road-going ambulance or a building which is occupied (such as a farm) or another means of calling help (such as a telephone box).
In addition, although the route may pass through rough or rocky ground, there must be no scrambling.
