Linepack at sunrise
![](https://www2.whoi.edu/site/ooi-expedition/wp-content/uploads/sites/143/2022/04/linepack_sunrise-copy.jpg)
Credit: Andrew Reed©WHOI
Coastal Profiler Mooring (CPM) line packs are tested early in the morning on deployment days. CPM anchors are recovered by means of an acoustic release. The release frees a float which rises to the surface pulling the line pack – an aluminum frame wound with thin, strong synthetic line- which unspools as the float rises. The line is still connected to the anchor below. The float is hooked by the ship, allowing the line to be connected to a winch for hauling the anchor back. A properly functioning release is critical to the operation, so testing is part of the normal routine.