Navigation

Marine Flag Signals

These are the marine flags signals you should know about.

Diving Operations Flag

Victorian law requires that any vessel with divers operating from it must always display signals by day and night to inform other vessel users.

Diving operations flag

The daytime signal for divers is an International Code Flag 'A' of size 6 being at least 750mm long and 600mm wide. It should be placed to ensure all-round visibility.

Divers operating without a vessel, for example from a jetty, should also display the International code flag "A". The flag should be at least 750mm long and 600mm wide. The flag may be displayed from a buoy. If displayed from a buoy, the flag must not be less than 300 mm in length and 200 mm in width. The flag must be clearly visible to all vessels operating in the vicinity.

Diving Operations Lights

During night diving, a vessel must show the international signal for a 'vessel restricted in its ability to manoeuvre'. These are three lights in a vertical line, top and bottom are red and the middle one is white. The diver's boat should also show other appropriate lights such as an anchor light.

Diving operations lights

Boat - Diving Operations

People involved in night diving without a vessel should display a yellow (orange) flashing light that can be seen from a minimum distance of 200 metres.

Speed Restriction

In Victoria, Australia, a five knot (9.25 kph) speed limit applies to vessel operators and waterskiers within a distance of 100 metres (330 feet) of a vessel or buoy on which a diver below signal is displayed.

Five Knot Speed Limit

International Code Flags

Other than the alpha flag, these are rarely seen by divers, however they may be useful to know.

The International Code Signal of Distress is indicated by the Code Flag "N" flying above the Code Flag "C".

International code flags

SALE / CLEARANCE [more]

New Products [more]

Brands [more]

500 PSI Adrenalin Air Dive Equipment Alpha Diving Products Analox AOI Limited AP Diving Apeks Apollo Scuba Aqualung AquaSketch Atomic Aquatics Atorch Lighting Australia Post Backscatter Barfell Best Divers Catahoula Manufacturing Inc Catalina Cylinders CDAA CineBags Cressi Cressi Swim Custom Divers DAN DiCAPac Dive Alert Dive Perfect Divesoft Dolphin Tech E-Shark Force Eezycut Faber Cylinders Fourth Element Fred & Friends Garmin Gear Aid Gear Keeper Glo-Toob H2Odyssey Hi-Max Hyperion i-Dive (i-Torch, i-Das, i-Pix) Intova Isotta IST Proline IST Sports Kraken Sports Land and Sea Light & Motion Mac Coltellerie Mares Medical Developments Metalsub Miflex Hoses Nautilus LifeLine Neptune Sports New Holland Publishers NiteCore Northern Diver Ocean Design Ocean Hunter Ocean Pro Oceans Enterprises OMS OrcaTorch PADI Performance Diver PowerDive Predator Probe Wetsuits Reef Line Salvimar Sammy Glenn Dives San-o-Sub Scuba Capsule Scuba Ninja SDI Sea & Sea Seac Sub Seaka Shark Shield Sharkskin Shearwater Research Si Tech Sonar Stalker SteriGENE Sterling Leisure Surf Lock Suunto TDI Tektite Termo Industria The Dive Spot The Scuba Doctor Tovatec Tribolube Trident Diving Equipment Tusa Tusa Sport Underwater Kinetics Unoflow Victorian Fisheries Authority View Swimming Gear Waterproof X-Adventurer XS Scuba

Copyright © 2005-2022 by The Scuba Doctor Australia, ABN 88 116 755 170. All rights reserved.
tel. +61 3 5985 1700 :: email. diveshop@scubadoctor.com.au :: Web site by it'sTechnical 2022