Circumferential Inspection Passes

Circumferential passes may be more efficient for pilings that have a very large diameter. The ROV is navigated to the piling and a circumferential pass is made with the ROV facing the piling. The ROV is then navigated vertically up or down to position the ROV for next circumferential pass, again while facing the piling. While moving to the level of the next circumferential pass, the camera should be pointed down slightly when descending, or up slightly when ascending. The next circumferential pass is then made in the opposite direction to prevent the tether from getting tangled around the piling. This pattern is repeated until full visual coverage of the piling is completed.

Circumferential passes are more difficult if the ROV does not include lateral motion capabilities.

Greensea's Orbit feature can be used to easily control the circumferential maneuver.

Using the pattern illustrated below, the tether will lay on the near side of the piling when moving to the next piling. In order to prevent tangles or excess drag, be aware of the tether location as you go around each piling and try to be consistent. This will also help when you return to your deployment point.