Our August (2005) exercise focused upon a combination of night navigation using a map and compass followed by an exercise using our GPS (Global Positioning Systems) units. Team Leader David T and Deputy Leader Chris M couldn't have planned it better if they tried. Cloud level down to about 400 metres meant that exercises on the Bennan and Benyellary were realistic, with little or no chance of identifiying landmarks.

Moving around this rugged hillside using a map and compass was good practice for experienced navigators, whilst trainee members were able to gain valuable experience in poor visibility.

The second phase of the exercise involved route finding using the GPS units. The exercise had been pre-planned using 10 figure grid references with Memory-Map software, and teams were directed around the hill to complete a fairly straight forward course. The value and accuracy of the GPS units was emphasised; even seasoned navigators, who had previously been sceptical about their worth were suitably converted!

Finding a cane peg, in the middle of nowhere, with no visible landmarks is no mean task, yet a GPS unit can achieve this easily. You must remember of course, that it only navigates in straight lines, and takes no account of the fact that there may be a cliff or gully between you and your destination. Hence the importance of a map!

The correct operation of a GPS unit is essential, and team members received instruction on how to use the advanced features of the equipment. With a little time and patience, the exercise illustrated just how accurately a 'point' can be located on the open hillside in very poor visibility.

A GPS unit is no substitute for a map and compass, and the ability to use them correctly, but they can be a valuable aid to navigation and great fun to use.