British Indian Ocean Territory: A Practical Guide
Key travel advice for authorized visitors covering strict access permits, currency, on-site utilities, and essential safety protocols for this restricted territory.
Understanding Access and Permits
It is critical to understand that the British Indian Ocean Territory (BIOT) is not a tourist destination. Access is exceptionally restricted and controlled by the BIOT Administration, primarily for defence purposes. There are no hotels, public airports, or commercial activities available to tourists. Unauthorised entry into the territory's waters or landing on any of its islands is strictly prohibited and carries severe penalties. All travel must be pre-approved and serve an official purpose.
Permits to enter the BIOT are granted to a very limited group, which includes members of the UK and US armed forces, associated contractors, and government officials on official duty. In rare cases, the BIOT Administration may grant permits to yachts in transit to visit the uninhabited outer islands, but these permits come with stringent conditions and are not guaranteed. Applications must be made well in advance, and visitors must prove complete self-sufficiency. Casual tourism or speculative travel is not permitted under any circumstances.
Money and On-Island Services
The official currency used on the main island of Diego Garcia is the United States Dollar (USD). All facilities, such as shops and services, are part of the military installation and are generally not accessible to anyone other than authorized personnel. For the rare visitor permitted to anchor at the outer atolls, there are absolutely no services. This means no banks, no ATMs, no currency exchange, and no shops. You must be entirely self-sufficient.
If you are an authorized contractor or visitor on Diego Garcia, you may be able to use credit cards within designated facilities. However, you should not rely on this. It is advisable to carry a sufficient amount of US dollars in cash for any personal expenses. For those on yachts visiting outer islands, financial instruments are irrelevant as there is no economy or infrastructure to engage with. All supplies must be procured before entering BIOT's territorial waters.
Connectivity, Power, and Water
Electrical systems in the BIOT vary. On Diego Garcia, you will find both US-standard Type A and B plugs (120V/60Hz) and UK-standard Type G plugs (240V/50Hz), depending on the building and its purpose. Authorized personnel should carry a high-quality universal travel adapter to ensure they can power their devices. For yachters, power is self-contained on their vessel.
Internet and mobile phone connectivity is extremely limited. On Diego Garcia, access is controlled and typically available only in designated welfare facilities for base personnel. Public SIM cards are not available for purchase. For this reason, a standard travel eSIM will not function within the territory. However, a global eSIM from a provider like SimMaxi is invaluable for staying connected in airports and layover countries on your journey to and from the territory. For visitors to the outer islands, the only reliable communication method is a satellite phone or a satellite data terminal.
On the military base of Diego Garcia, tap water is treated to potable standards and is generally considered safe to drink. However, for anyone visiting the outer atolls, there are no freshwater sources. All drinking water must be carried on board or produced with a reliable desalination system (watermaker). It is unsafe to consume water from any natural source on the islands without proper, verifiable treatment.
Health, Safety, and Emergencies
Medical facilities in the BIOT are located on Diego Garcia and are exclusively for the use of military personnel and authorized contractors. They are not equipped or staffed to handle the public. Obtaining a permit to enter the BIOT requires proof of comprehensive medical and travel insurance that specifically includes emergency medical evacuation. The cost of a medical evacuation from this remote location can be extraordinarily high, and the responsibility for arranging and funding it rests solely with the individual.
There is no public transport system in the territory. Movement on Diego Garcia is managed via official vehicles, bicycles, or walking. There are no taxis or rental cars. Any transportation needed for official duties will be arranged by the host command. For yachters, the only mode of transport is their own vessel and its dinghy. Navigating the reefs and atolls requires expert seamanship and careful planning, as navigational aids are minimal.
Local Etiquette and Regulations
As there are no commercial establishments, tipping is not a part of the culture. All interactions will be with military or official personnel in a professional context. The most important etiquette is to strictly adhere to all rules and regulations provided with your permit. The BIOT is a massive Marine Protected Area (MPA), and environmental preservation is paramount. All fishing is prohibited, and there are strict 'no-take' rules for all marine and terrestrial life. Visitors must pack out everything they pack in, leaving no trace of their visit.
The official language of the administration and the working language on Diego Garcia is English. Due to the territory's unique administrative and demographic status—with no permanent or indigenous population—there are no local phrases to learn. All communication will be in English with UK, US, or other international personnel. It is important to be aware of the territory's complex history, but visitors should avoid engaging in political discussions and focus on complying with the territory's current laws.
Stay connected when you land
With a SimMaxi eSIM, you can get online without hunting for a physical SIM card.