1. Route
Click along the fibre route to add points (zoom in and use Satellite for accuracy). Drag a point to move it; drag the faint dot between two points to add one. Press Done when finished.
Saved routes stay in this browser only.
2. OTDR reading
Corrections (launch cable, index, slack, accuracy)
Fibre is normally 0.5–2 % longer than the cable route (helix, loops, route inaccuracies). Leave at 0 to treat OTDR distance as route distance.
3. Estimated break
Position
From measuring end
From other end
Range
OTDR → fibre
RouteOTDR to breakAccuracy range
Estimate only. Confirm on site with a visual fault locator or a second trace before digging.