Question 1

When is the best time to dive Guam's Blue Hole with calm conditions?

Accepted Answer

February through May is the sweet spot for calmer seas and lighter winds on the leeward west coast. The Blue Hole begins near {{ 18 | distance:m }} and opens around {{ 38 | distance:m }}, so you want low surge for the wall drift. If trades build or there are swell advisories, operators may switch to Apra Harbor reefs where conditions remain manageable. Always carry an SMB for open water pickups outside the harbor.

Question 2

How do I dive the Tokai Maru and SMS Cormoran in one trip?

Accepted Answer

Book a guided charter from Cabras Marina with an operator experienced in Apra Harbor wrecks. The sites are deep recreational dives, so Advanced Open Water and recent deep experience are recommended. Expect currents on ascent and boat traffic. Use nitrox if available and stay within no decompression limits. A reel and SMB help for a controlled drift pickup after exploration around the wreck pair.

Question 3

What are Guam's marine preserve rules for snorkelers and divers?

Accepted Answer

Marine preserves such as Piti Bomb Holes and Tumon Bay prohibit taking or disturbing marine life and ban anchoring on coral. Enter over sand, keep fins off the bottom, and never touch or collect coral, shells, or live rock. Use reef safe sunscreen and mooring buoys where provided. Rangers actively patrol and boundaries are marked on shore signs.

Question 4

Do I need a visa to visit Guam and what forms are required?

Accepted Answer

Requirements match U.S. destinations. All arrivals must complete the Guam Electronic Declaration Form, one per family, up to 72 hours before landing. Many travelers from Australia, Japan, Korea, and other listed places can visit visa free for up to 45 days under the Guam CNMI Visa Waiver using the new ETA. U.S. travelers need acceptable REAL ID compliant identification for domestic flights starting May 7, 2025.

Question 5

What exposure protection and gear should I bring for Guam?

Accepted Answer

Water sits near {{ 27 | temperature }} to {{ 29 | temperature }}. Most divers are comfortable in a 3 mm suit or a skin with a thermal top. Booties help for occasional shore entries. Bring an SMB and whistle for blue water pickups, a compact torch for caverns and wreck nooks, and a lightweight rain shell for boat rides during rainy months. Pack reef safe sunscreen for preserves.

Question 6

How reliable is public transport for dive logistics on Guam?

Accepted Answer

The Guam Regional Transit Authority runs limited bus routes roughly from early morning to early evening Monday to Saturday, with no service on Sundays. Routes do not consistently reach marinas on dive schedules. Most divers rent a car, arrange hotel shuttles, use taxis, or book Stroll Guam ride hailing to reach Cabras Marina on time for morning departures.

Question 7

Are there jellyfish or man o' war seasons I should plan around?

Accepted Answer

Box jellyfish pulses and Indo Pacific man o' war reports occur in some summer windows, especially around July. Wear a rashguard, avoid contact with any washed up tentacles, and follow local advisories. If stung, exit the water, rinse with vinegar or seawater, and seek medical assessment if symptoms escalate. Operators will monitor conditions and advise safe alternatives.

Question 8

Where should beginners dive in Guam and what sites are better for advanced divers?

Accepted Answer

Beginners will enjoy Apra Harbor sites like Gab Gab II and Western Shoals for moderate depth and abundant fish. Advanced divers target Blue Hole, Sharks Pit, and the Tokai Maru plus SMS Cormoran wreck pair. Conditions outside the harbor can include current and surge, so plan with your operator and be honest about recent experience to match sites to skills.

Question 9

Is there a hyperbaric chamber on Guam and how is emergency care handled?

Accepted Answer

Yes. Guam Regional Medical City operates hyperbaric oxygen therapy services and a 24 hour emergency department. Guam Memorial Hospital in Tamuning also runs an emergency department. Dial 911 for emergencies and contact DAN at +1 919 684 9111 for diving medical support. Charter captains coordinate with the U.S. Coast Guard for on water incidents.

Guam

Wrecks from two world wars, a heart shaped blue hole, and tropical walls in the Western Pacific

Why Guam for water people

Marine setting and conditions

Access and operators

Rules and etiquette

Topside

Don't miss while you're here

Blue Hole wall drift

Tokai Maru and SMS Cormoran double wreck

Snorkel Piti Bomb Holes