Gab Gab

Verified2026-09-24 checkedReefMacroNight

A sheltered harbour reef that is diveable when the outside of the island is not, and good enough to dive for its own sake.

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Depth: 5–24 m16–79 ft
Difficulty: Beginner
Entry: Shore · Boat
Typical current: None
Coordinates: 13°26.232′N 144°39.384′E
Activities: Scuba · Snorkelling · Freediving

Gab Gab sits inside Apra Harbor, which is the whole point of it: when swell shuts the exposed coast, this is open. A coral shelf runs from about 5 m down to a sand slope in the low twenties, with a mooring chain descending through the blue as the landmark everyone navigates by. It is where Guam teaches, so expect classes — and it is also one of the better macro dives on the island, with cuttlefish, garden eels out on the sand and enough on the shelf to carry a night dive. Access is through a naval base and has to be arranged by an operator.

Inside Apra Harbor on the US Navy base; entry is arranged by a local operator, not independently.

Best season

Good

Before you get in

A night site. A backup light and a navigation plan matter more than usual.

Taken from this site’s recorded depth, type and current, and nothing else. An empty list is not a safe site — the sea on the day, the local geography and the boat traffic are not in it. The briefing on the spot comes first.

Conditions

Air temperature: 26°C79°F
Water temperature: 29.4°C85°F
Wave height: 1.6 m5 ft
Wind speed: 10.7 km/h6.6 mph

Updated 2026-10-07 16:15 UTC · Source: Open-Meteo

Weather data by Open-Meteo.com (CC BY 4.0)

Conditions are reported for information only. Assess the site yourself and follow your guide and your training.

No live conditions for this site yet.

We only show numbers we can attribute to a source.

Sea state and tide

On a date

Tide · 10/8

High04:500.82 m
Low11:150.24 m
High17:500.88 m

Forecast heights against mean sea level. Real tides in a bay, a harbour or over a flat can differ — check an official tide table before you get in.

Pick a day to see its tide

Only wave height and wind are scored, because those are what close a boat ramp or a shore entry. Water temperature is reported and never scored: 12°C is an ordinary dive in a drysuit and punishing in a 3 mm, and a number that cannot see your suit has no business marking it down. Stars do not decide whether you get in — you and your guide do, on the day.

Weather data by Open-Meteo.com (CC BY 4.0)

Marine life you may see

Spotted garden eelHeteroconger hassiCommon
Clark’s anemonefishAmphiprion clarkiiCommon
NudibranchNudibranchiaCommon
Bluestreak cleaner wrasseLabroides dimidiatusCommon
Giant morayGymnothorax javanicusCommon
Broadclub cuttlefishSepia latimanusSeasonal
Staghorn coralAcropora spp.Common
TrumpetfishAulostomus chinensisCommon
Moorish idolZanclus cornutusCommon
Feather starCrinoideaCommon
Blue sea starLinckia laevigataCommon

From divers

What people who were in the water reported. Not a forecast, and not a judgement about whether the site is safe to dive.

No recent reports from divers. If you dived here in the last two weeks, you can say how it was.

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