Sokkia SRX1 Operator's Manual page 124

20. SURFACE AREA CALCULATION
3. Select the first point in the list and press [OK].
The coordinates of the first point are set as "01".
4. Read in coordinates of point 2 and onward
Repeat steps 2 to 3 until all points have been read
in.
Points on an enclosed area are read in a clockwise
or counterclockwise direction.
After all known points necessary to calculate the
surface area have been observed, [CALC] is
displayed.
5. Press [CALC] to display the calculated area.
6. Press [OK] to return to <Area/key in coord.>.
Press {ESC} or tap the cross in the top-right
corner to quit area calculation.
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