Tenders were the workhorses of the U.S. Lighthouse Establishment of old. They took care of navigational aids, including lighthouses, fog signals, and buoys. They built these aids, maintained them, and took are of the people who lived at lighthouses. An excellent book about tenders was written in 2000 by Douglas Peterson, USCG Retired. Copies are still available on eBay and Amazon.
One surviving tender is the USLHST Lilac. Here's some info about it--
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