Yes, 潮汐表-寒珊退潮表&潮汐赶海查询助手 is free to download, however it contains in-app purchases or subscription offerings.
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潮汐表-寒珊退潮表&潮汐赶海查询助手 has several in-app purchases/subscriptions, the average in-app price is $8.49.
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