A sonde is a small transmitter that can travel with a sewer camera. A compatible receiver above ground can help the technician find the camera head. That lets the crew tie a visible defect to a surface location instead of relying only on how much cable went into the pipe.
Ask which point the mark represents
A mark might identify a damaged joint, the end of the inspection, or a bend. Request a photo with a fixed landmark and ask which video timestamp matches the mark. If you receive an estimated depth, keep it with the inspection notes.
Clarify what the mark covers before digging
A camera locator identifies the transmitter. Ask the contractor what other utility locating or site checks are needed before excavation. Keep the footage and marked location together when requesting repair estimates so bidders can compare the same section.
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