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A hybrid marker, also known as a referencing exit marker or REM, is a more recently developed line marker used as a directional marker by the diver placing it, and seen as a cookie by others. They are rectangular with slots like the arrow and cookie forms for attachment to a line, and have a relatively large blank space on one end to add ...
The length of the distance line used is dependent on the plan for the dive. An open water diver using the distance line only for a surface marker buoy may only need 50 metres (160 feet), whereas a cave diver may use multiple reels of lengths from 25 ft (7.6 m) to 1000+ ft (300 m).
Some of these signals, or pre-arranged variants, can be used with a surface marker buoy. The diver pulls down on the buoy line to make the buoy bob in an equivalent pattern to the rope signal. Effective line signals need a free line without much slack – before attempting a line signal, the slack must be taken up, and the line pulled firmly.
Nav finder and underwater compass – basic underwater navigation tools Suunto SK-7 diving compass in aftermarket wrist mount with bungee straps. Diver navigation, termed "underwater navigation" by scuba divers, [1] is a set of techniques—including observing natural features, the use of a compass, and surface observations—that divers use to navigate underwater.
Line markers are generally used on permanent guidelines to provide critical information to divers following the line. Slots and notches are used to wrap the line and secure the marker in place. Passing the line through the enlarged area at the base of the two slots allows the marker to slide along the line, or even fall off if brushed by a diver.
A surface marker buoy, SMB, dive float or simply a blob is a buoy used by scuba divers, at the end of a line from the diver, intended to indicate the diver's position to people at the surface while the diver is underwater.
The line should be longer than the depth of the dive site at the deepest state of the tide during the dive, and at least 10 mm (0.4 inch) in diameter. A thick line is used because the shot weight is often lifted by pulling the line by hand and the pressure of a thin line can cause pain and injury to the hands when the shot is recovered.
Main article: Line marker. Personal non-directional line markers that mark specific locations, or the direction of one's own exit at line intersections. copper hat copper helmet. See: Standard diving dress. A diving helmet of traditional design and construction, usually made from spun or beaten copper, with brass or bronze fittings.
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