IOTA stands for Islands On The Air. Many people collect islands the same way others search QSO's with counties, or countries etc. All of the Hawaiian Islands are the same IOTA designator OC019. Here are some other Pacific Island designators:
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OC009 KC6 - Palau OC010 V63 - Pohnpei OC011 V63 - Truk OC012 V63 - Yap OC013 ZK1 - Rarotonga OC014 ZK1 - Manihiki OC015 T2 - Tuvalu OC016 3D2 - Vanua/Viti Lev OC017 T30 - Gilbert OC018 T30 - Banaba OC019 KH6 - Hawaiian OC020 KH7K - Kure OC021 YB - Java OC022 YB9 - Bali OC023 KH3 - Johnston OC024 T32 - Christmas OC025 P2 - Admiralty OC026 KH2 - Guam OC027 FO - Marquesas OC028 V73 - Ralik OC029 V73 - Ratak OC030 KH4 - Midway OC031 C2 - Nauru OC032 FK - New Caledonia OC033 FK - Loyalty OC034 YB/P2 - New Guinea OC035 YJ - New Hebrides OC036 ZL1/2 - North Island OC037 ZL9 - Campbell OC038 ZL7 - Chatham OC039 ZL8 - Kermadec OC040 ZK2 - Niue OC041 P2 - Ninigo OC042 DU1/4 - Luzon OC043 T31 - Phoenix OC044 VR6 - Pitcairn OC045 KH8 - Tutuila OC046 FO - Windward OC047 H4 - Solomon OC048 ZK3 - Tokelau OC049 A3 - Tongatapu OC050 FO - Ruruta OC051 FO - Rapa OC052 FO - Duke/Gloucester OC053 KH9 - Wake OC054 FW - Wallis OC055 KH6 - Fren. Frigate OC056 VR6 - Henderson
There are at least two excellent maps of the South Pacific Islands. First is Reference Map of Oceania, Cartography by James A. Bier, Published by the University of Hawaii Press.
The other is a small map used for the Class Antro 350 entitled The Pacific Islands, published by the Hawaii Geographic Society. It is particularly strong on geopolitical detail.
Both of these maps are available in the UH Book Store on the UHM Campus.
08/99