Leica GPS1200 Series Technical Reference Manual page 527

CONFIGURE
Hidden Pt Device
Offsets
Config...\Interfaces... - General
Description of fields
Field Option
<Height
Offset:>
None
Device Ht
CONT (F1)
To accept changes and to return to
CONFIGURE Hidden Point Measurements.
Description
Available for <Compute Ht: Yes> in CONFIGURE
Hidden Point Measurements.
No height offsets are used. The result is the delta
height between the centre of the device and the
aimed point. Refer to paragraph "Diagram".
When measuring hidden points, the height of the
hidden point measurement device can be typed in.
This option should be used when the hidden point can
be directly measured using the hidden point device.
Refer to paragraph "Diagram".
GPS1200 527