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Tokyo Haneda Airport
HND • RJTT
Major Tokyo airport with road and rail connections toward Chiba; no direct scheduled flight to the southern Boso diving bases.
Logistics · Destination Guide
From Tateyama shark encounters to Katsuura macro reefs, just beyond Tokyo.
Use this travel brief to set arrival flow, local transit, and gear movement before you lock your itinerary.
Fly to a Tokyo-area airport, then choose one side of the peninsula. For Tateyama, take the JR Uchibo Line via Chiba/Kisarazu or a relevant Tokyo-Tateyama express bus, then arrange an operator transfer, local bus or taxi to Ito or the exact beach. For Katsuura, JR Sotobo and limited-express Wakashio provide Tokyo connections. Local JR service continues toward Ubara and Namegawa-Island; confirm the final road segment and check train times for the travel date. Road trips use the Chiba Peninsula highways, with possible Tokyo Bay Aqua-Line congestion. Neither base is an island transfer or liveaboard gateway.
Tokyo Haneda Airport
HND • RJTT
Major Tokyo airport with road and rail connections toward Chiba; no direct scheduled flight to the southern Boso diving bases.
Transport: Train via Tokyo/Chiba toward Tateyama or Katsuura, Rental car or arranged road transfer
Narita International Airport
NRT • RJAA
International airport in Chiba Prefecture, with onward rail or road travel to the Boso coast.
Transport: Rail via Chiba or Tokyo connections, Rental car or prearranged transfer
Tateyama: a train or bus to Tateyama does not itself reach Ito Shark City; BOMMIE details an Ito Gyoko bus stop and some arranged station pickup. Check active bus timetables because published model schedules may be stale. Katsuura: the JR Sotobo corridor accesses Katsuura and Ubara, but Namegawa cooperative meeting points and gear transfers may need a taxi, a car or guided pickup. Consider two separate overnight bases if diving both circuits. Do not assume harbor access, boat departures or a cross-coast passenger ferry.
Japan passport, visa and permitted length of stay rules depend on nationality and travel purpose. MOFA lists many tourist visa-exempt nationalities for short stays of generally 90 days, with specific restrictions for some passports; check the official current MOFA schedule. Foreign visitors need a valid passport and applicable entry authorization, if required. Scuba operators additionally require their own dive certifications, documented experience, medical screening and sometimes language-specific booking channels. There is no destination-specific entry tax verified for this land-based Boso circuit.
BOMMIE lists wetsuit comfort mainly late May to early November and recommends a hooded layer much of that time; colder winter/spring diving may require proper drysuit planning. It does not advertise drysuit rentals and uses yoke tank connectors, with no DIN adapters on offer. Its full wetsuit kit does not include a computer. Katsuura Diving Service and Namegawa advertise equipment and tank services. Contact each operator for sizes, advance shipping, storage, computer, gloves, SMB and regulator compatibility; rental and extra fees can vary.
Japanese Yen (JPY)
Payment is in Japanese yen. BOMMIE lists cards, yen cash and PayPay; small fishing-village vendors, buses or beach stalls may need cash. Official visitor guidance recommends carrying some yen.
Seven Bank and Japan Post Bank ATMs are widely used by foreign-card holders, but availability and withdrawal fees differ. Withdraw before leaving major stations or arriving at a small fishing base.
100V • 50Hz (eastern Japan) • A, B
Japan runs 100V, and the Chiba/Tokyo region is 50Hz. Type A two-flat-pin is standard; grounded B may be available but should not be assumed. Check chargers and power adapters for dual voltage.
Communications
Coverage is generally available in towns, but individual coastal launch areas and valleys can be weaker. Download offline Japanese maps and carry an eSIM/SIM that works on Japanese networks; do not assume reliable data on boats. Confirm exact port coordinates with the operator without fabricating a site pin.
Language
Japanese is the operating language at many local dives. BOMMIE has a separate English reservation page and lists English-speaking partner shops, while PADI lists Katsuura and Namegawa primarily with Japanese language. Arrange dive safety briefings in a language you understand and verify that the guide, not only the booking agent, can communicate it.
Insurance
Choose cover that explicitly includes recreational scuba to your planned depths and conditions, plus evacuation and recompression when appropriate. Verify that guided boat diving, any advanced underwater overhead activity and freediving or skin-diving are covered separately. A provider listing dive insurance in its package is not a substitute for reading your own policy. Ask about exclusions, emergency contacts and documentation before departure.
Packing list
Bring medical and certification documents, a recent dive log, gloves, surface marker buoy, dive computer and warm exposure gear. Ito reports water from about 14°C in cold periods to as high as 27°C at some summer times, with notable day-to-day changes. Include hood/vest or appropriate drysuit plan for colder months. For snorkel and skin diving, bring suitable flotation, sun protection and a buddy. For shore trails, pack non-slip shoes and a rain layer.