This vessel is an enlarged and updated version of the earlier Shikishima.[1] Aviation facilities have also been enhanced: whereas Shikishima is carrying Eurocopter AS332 helicopters, this vessel is able to carry the larger EC225LP Super Puma.[1]
Weapons have also been updated and enhanced.[1] As for the large calibre autocanon, the vessel is equipped with two single-mounted Bofors L/70 40 mm guns, as opposed to the double-mounted Oerlikon L/90 35mm guns of the Shikishima. These autocanons are the same as those carried by the Aso-class and Hida-class, and are capable of precision firing with an optical director.[2] The JM61 20 mm guns are also upgraded to the production version as the other vessels, while the Shikishima is equipped with the earlier prototypes.[2]
In 2015, during the Emperor's and Empress's visit (行幸啓, Gyōkōkei) to Palau, Akitsushima was used as an accommodation ship. Slopes and handrails were set up so that both elderly Majesties could get on board comfortably.[4]
Kaijin-sha, ed. (July 2014). "New Type Ships of Japan Coast Guard". Ships of the World (in Japanese) (800). Kaijin-sha: 144–147. NAID40020105615.
Nakanomyo, Masami (November 2015). "History of shipboard guns on JCG's patrol vessels". Ships of the World (in Japanese) (825). Kaijin-sha: 168–173. NAID40020597434.
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