Suunto PM5, 1520 manual 24,6m= 12,8m 52 × 100

Calculate:
--------23	+	--29------	=	--------52
100		100		100

Take 52 per cent of 25 m / 82 ft. This is 13 m / 42.6 ft. Multiply this by the cosine of 9 degrees.

0.987 x 13 m = 12.8 m or equally in feet 0.987 x 42.6 ft. = 42 ft. Method 2. Multiply the ground distance by the slope angle cosine.

0.987 x 25 m = 24.6 m or equally in feet 0.987 x 82 ft. = 80.9 ft.

Add percentage readings as above and take the sum percentage of the corrected distance.

-------- 24,6m= 12,8m

52 ×

100

or equally in feet

-------- 80,9ft= 42ft

52 ×

100

This example shows that a slope angle of 9 degrees causes a correction of only

2.3per cent but when the slope angle is 35 degrees the correction means a reduction of about 18 per cent in the observed height.

14