Leica GPS1200 Series Technical Reference Manual page 1047

Measure to arc - vertical
measurements
Reference Line
Target point outside arc
d4
P0
GPS12_117b
P3
P0
GPS12_122
d3
d2
P0 Start point
P1
P1 End point
P2 Measured point
d5
P3 Reference point
d1
P3
d2
d3
P2 d4
d1
d5
P1
P2
d2
P0 Start point
d1
P1 End point
P2 Measured point
P3 Reference point
d1
d2
GPS1200
Δ
< Offset:>
Δ
< Arc:>
Δ
< Arc-End:>
<Check Dist 1:>
<Check Dist 2:>
<ΔHt-Start:>
<ΔHt-Arc:>
1047