Press [F4] [S .FUNC] of the PowerTopoExpress 2 screen to view the“PENTAX Special
Func” screen.
Select STATION and press[ENT] or [select] to view the “STATION” screen.
Select 3. POINT TO ARC and press [ENT] to view POINT TO ARC screen.
Set Station Point (SP), Target Point (P) and an arbitrary circle, then obtain the distance from point P to the arbitrary circle.