Sokkia SRX1 Operator's Manual page 123

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.
PROCEDURE Surface area calculation using registered coordinate data
Coordinate data registered in Program mode (SDR) can be recalled and used for area calculations.

Series SRX SDR Software Reference Manual
1. Select "Area calc." in <Menu>.
2. Press [READ] to display the list of registered
coordinate data.
20. SURFACE AREA CALCULATION
115