Leica GPS1200 Series Technical Reference Manual page 1041

Reference Line
Field Option
<Height User input
Offset:>
<DTM Offset:> User input
<Rotate Line:> User input
Next step
CONT (F1) closes the screen and returns to REFLINE Choose Task & Reference Line.
Description
Available for <Heights: Use Start Point> and
<Heights: Use Ref Line>. The vertical offset of the
reference line/arc.
Available for <Heights: Use DTM Model>. The
vertical offset of the DTM model.
Available for <Task: XX Line> unless <Heights: Use
Ref Line> in REFLINE Configuration, Heights
page. Angle by which to rotate the reference line.
GPS1200 1041