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The number might be three on each side of a small 10-metre (33 ft) boat up to 20 on each side for a 30-metre (98 ft) vessel with 1500 hp. [2] The great weight and strength of the gear can disturb the ground it is towed over, overturning rocks and dislodging and crushing organisms in its path.
A line holder is a simple device for storing and deploying line underwater. A simple type is an H-shaped piece of wood, plastic or stainless steel used to manually wrap a moderate length line. It may be used in conjunction with a surface marker buoy or a delayed surface marker buoy by divers, or for a short guide line.
The Sailfish sailboat is a small, hollow body, board-boat style sailing dinghy. The design is a shallow draft , sit-upon hull carrying a lateen rigged sail mounted to an un- stayed mast . This style sailboat is sometimes referred to as a "wet boat" because, with its minimal freeboard , the sailor often gets splashed by spray as the boat moves ...
Shot, line and reel on dive boat. The shot is deployed, generally from a boat, after the dive site is located using position fixing such as GPS and an echo sounder. Shots are more difficult to use in strong currents. The weight may drag along the seabed especially if the divers pull on the line as they descend.
The buoy marks the diver's position underwater so the dive boat crew can locate the diver even though the diver may have drifted some distance from the dive site while doing decompression stops. A reel and line connect the buoy on the surface to the diver beneath the surface. A DSMB can help the diver maintain accurate depth during a ...
The diver must be able to safely reach a reliable alternative source of breathing gas at all times during the planned dive. Plans for technical contingencies may include arrangements for alternative equipment, spares, alternative boat etc. The level of contingency planning will depend on the project, and the importance of the task.
Stitch and glue is a simple boat building method which uses plywood panels temporarily stitched together, typically with wire or zip-ties, and glued together permanently with epoxy resin. This type of construction can eliminate much of the need for frames or ribs. [ 1 ]
The draw-backs to helmet mounted lights are that it can increase the risk of snagging the helmet on obstructions and an increased potential to inadvertently dazzling dive buddies. [9] Sidemount divers may choose to make their own helmet by adapting an existing climbing, kayaking or skate-boarding helmet, or may purchase an off-the-shelf cave ...