Gabo Island sits off the far-east tip of Victoria near the New South Wales border, a striking pink-granite island with reef diving out to around 22 m. The site is exceptional but remote — kelp gardens, sponge cover, gorgonian fans, big crayfish, abalone, weedy seadragons, blue devils and a steady stream of pelagic visitors brought in on the warm East Australian Current that swings down past Gabo. Boat access only, run from Mallacoota with the inlet bar to cross. Best in light north-westerlies with swell under a metre and tide near slack. Use the live 7-day wind and swell forecast on this page to plan. Advanced divers — exposed open ocean, currents around the island corners, very remote location, long run from Mallacoota each way. Pick a properly settled forecast and have a back-up plan in case conditions deteriorate while you're on the water.
How far you can see underwater — measured in metres. 10m+ is great, 5–10m is workable, under 3m is murk. Driven by wind, swell, and recent rain.
Long-period waves rolling in from the open ocean. Direction matters more than height — a S swell hits Portsea hard, but an E swell rolls past. Period over 12 s = real ocean punch.
Offshore (N or NE) flattens the surface and clears the water. Onshore (SE through SW) chops it up and stirs sand. Calm or light offshore is the magic combo.
This site faces the open ocean. The exposure caption above shows which directions slam in. Anything from the opposite side gets blocked — that's the safest window.
Slack water — the 30 minutes either side of high or low — is calmest and clearest. Mid-tide brings the most flow. Plan to be down at slack, up before the run picks up.
Bass Strait sits 14–16 °C autumn–winter, 17–19 °C summer. Below 16° a 7 mm hooded keeps you warm for 60 min+. Drysuit if you're going long.