Gyrofield, you say?
Per this exceptional decade-long blog featuring WW2 Japanese installations (the link for this particular location is here https://airport1111.blog.ss-blog.jp/matsunami-airstrip but is in Japanese), this was the staging area for the use of Kayaba Ka-1 (reverse-engineered Kellett KD-1) observation autogyros which were used here primarily for submarine spotting.
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