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Islands on the Air (IOTA) is an award and operating program that encourages amateur radio contacts with stations located on islands around the world. Managed by the Islands on the Air Ltd (formerly administered by the RSGB), IOTA groups the world's islands into numbered island groups and awards operators who contact a qualifying number of them.
IOTA has been running since 1964 and maintains a loyal following among DX enthusiasts. The program adds a geographic dimension to DX chasing — rather than focusing on countries, IOTA is about islands, from major landmasses like Great Britain and Japan to remote atolls in the Pacific.
The IOTA system assigns every qualifying island to a numbered IOTA group. Each group is identified by a continent prefix and a number:
The continent prefixes are: EU (Europe), AF (Africa), NA (North America), SA (South America), OC (Oceania), AS (Asia), and AN (Antarctica).
Islands are grouped together when they are geographically close and politically related. For example, all of the Hawaiian Islands form one IOTA group (OC-019), and the Channel Islands off the English coast form another (EU-114). The total number of IOTA groups is over 1,200, though not all have been activated.
To earn an IOTA award:
The basic IOTA award requires confirmed contacts with 100 IOTA groups, including at least one group from each of the continent areas in which you claim credits. Higher award levels are available at increments above 100.
IOTA offers a progressive series of certificates and plaques:
Most IOTA contacts are made in one of these ways:
Resident island operators. Many IOTA groups contain islands with resident amateur populations. Great Britain, Japan, Australia, and numerous Caribbean and Mediterranean islands have active operators year-round. These "easy" groups will form the bulk of most operators' IOTA totals.
IOTA DXpeditions. For rarer groups — especially uninhabited islands and remote atolls — dedicated DXpedition teams travel to the island and activate it. IOTA DXpeditions are announced in advance and attract significant pileups. Following DXpedition news on websites, mailing lists, and the IOTA programme page helps you be ready when rare groups become active.
IOTA Contest. The annual RSGB IOTA Contest (held in late July) is the single best opportunity to work a large number of IOTA groups in a short time. Island stations are the multipliers in this contest, and many operators make a point of being on islands for the event. The contest attracts island activations from groups that might not be heard during the rest of the year.
Holiday activations. Operators visiting islands on holiday sometimes bring radio equipment and operate under their own callsign or a guest licence. These casual activations can provide contacts with less common groups.
Operating from an island for IOTA credit follows rules defined by the programme:
Practical considerations for island activations include transportation logistics, licensing (you may need a reciprocal or guest licence), antenna options on potentially limited terrain, power supply, and weather exposure. Some island activations require boat transport and camping equipment.
Club Log (clublog.org) provides the primary electronic confirmation pathway for IOTA. When both the island station and the chaser upload their logs to Club Log, the system automatically matches contacts and generates IOTA credits. This has significantly streamlined the confirmation process compared to the older QSL-card-only system.
Operators who have been active for years may also use traditional QSL cards, which must be verified by an IOTA checkpoint (volunteers who examine cards at hamfests and by appointment).
IOTA and DXCC overlap but measure different things:
Some DX entities are also rare IOTA groups, so DXpeditions often satisfy both DXCC and IOTA chasers simultaneously. But many common DXCC entities (mainland countries) do not count for IOTA, and many IOTA groups are within easy-to-work DXCC entities.
The two programs are complementary, and many DX-oriented operators pursue both.