Readings below horizontal line are
a r e p o s i t i v e.
TM 5-6675-322-14
NOTE
negative; those above horizontal line
(d) If one reading is negative and the other reading is positive, a d d
the two readings to obtain height.
If both readings are the same (both positive or
both negative), subtract the smaller reading from the larger reading to obtain
h e i g h t.
(4) Measurement of vertical angle as percent. To obtain percentage of
slope:
(a) Observer presses release button and takes observation on a point up
slope (or down slope) which is at breast height.
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