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2. Dive light - Wikipedia

   en.wikipedia.org/wiki/Dive_light

   LED (light emitting diode) - are very durable, efficient and powerful. HID (high intensity discharge) - are extremely powerful and have a nearly white beam. On the downside, HIDs are very delicate and quite expensive. [7] A modern dive light usually has an output of at least about 100 lumens. Bright dive lights have values from about 2500 lumens.

3. DSV Limiting Factor - Wikipedia

   en.wikipedia.org/wiki/DSV_Limiting_Factor

   The lower viewport and CTD probe Detail view of the dive weight release mechanism and one of the LED light panels. The forward and downward view through the three ultra-wide angle acrylic viewports is unobstructed by structure or appendages, and illuminated by ten externally mounted high output LED lighting panels of 20,000 lumens each.

4. Buoy - Wikipedia

   en.wikipedia.org/wiki/Buoy

   Shot buoys mark dive sites for the boat safety cover of scuba divers so they can descend to dive sites more easily in conditions of low visibility or tidal currents and more safely do decompression stops on their ascents. Surface marker buoys are taken on dives by scuba divers to mark their positions underwater. [15]

5. Navigation light - Wikipedia

   en.wikipedia.org/wiki/Navigation_light

   Watercraft navigation lights must permit other vessels to determine the type and relative angle of a vessel, and thus decide if there is a danger of collision. In general, sailing vessels are required to carry a green light that shines from dead ahead to 2 points (22 + 1 ⁄ 2 °) abaft [note 1] the beam on the starboard side (the right side from the perspective of someone on board facing ...

6. Diving equipment - Wikipedia

   en.wikipedia.org/wiki/Diving_equipment

   Dive boats. Day boats, which may be rigid-hulled inflatable boats; Live-aboard dive boat; Dynamically positioned vessels; Echo sounder, side-scan sonar and multi-beam sonar for location, depth measurement, and profiling of dive sites; GPS receiver - for locating dive sites; Surface-supplied diving breathing gas supply system, including:

7. Day shapes - Wikipedia

   en.wikipedia.org/wiki/Day_shapes

   The appropriate lights may also be displayed during the day at times of restricted visibility or other necessary circumstances. [3] Vessels under 7 meters are generally not required to display day shapes even if they are required to display lights at night. [4] A square black flag displayed over the ball may be used as a distress signal. [5]