navigation Trail talk: measuring gradients with a slope card Slope cards can be a useful tool when planning a route or determining the risk of avalanche Trail talk: measuring gradients with a slope card
map measurer Map measurer of the month- Rotameter (Barker & Son) “This handy little instrument will be found very useful for […] Map measurer of the month- Rotameter (Barker & Son)
Three Points of the Compass 