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Distances and ascents

Distances and the amount of climb are quoted to the nearest kilometre (or mile) and 10m (or 100ft) of ascent.

Timings

All timings are those measured by the author’s GPS device as he checked the routes. This device stops recording walking time whenever the walker stops, even for a few seconds, so the total time required to complete a walk will be considerably longer than that given in the guide. You should make an allowance for refreshments stops, taking photos and your own pace and fitness.

Grid references

All grid references are 10-figure references taken from the author’s GPS device, but rounded up or down to the nearest 10m. A full grid reference with the letters indicating the grid square is given in the information box at the start, but letters are only used in the grid references in the route description if the route crosses into a different grid square.

Heights

Summit cairn on Meall Dubh (Route 36)

Where spot heights are given on the route maps these figures are used in the route description. All other heights were measurements from the author’s GPS device quoted to the nearest 5m. GPS does not measure height as accurately as it does horizontal position and it is possible that some of these readings are as much as 10m out. For Corbetts (but not for other summits) the height is also given in feet; note that this is not the conversion of the metric height, but is the height given on the OS 1 inch: 1 mile map, most of which are derived from surveys in the 1950s.