Each of the caches nearby named "TSPTOB" are part of the mystery cache "The Sunny Port Town Of Barnsley". You do not need to do the mystery cache to be able to find the indiviual caches, these can be done as standalones if you wish.
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Looking at your initiation scroll it looks like the captain wants you to check on Nessie the Goose's eggs while she's out getting her feathers cleaned. You better be quick, she'll be back soon!
Good luck pirates!