
1) Bollards 2) Deck posts 3) Deck posts for cables 4) Mooring line posts 5) Mooring posts 6) Ship deck posts 7) Strong posts 8) They secure ship ropes 9) Vertical ship posts 10) Watercraft component
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https://www.crosswordclues.com/clue/bitts

1) Bollards
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https://www.crosswordclues.com/clue/bitts

Bitts are paired vertical wooden or iron posts mounted either aboard a ship or on a wharf, pier or quay. The posts are used to secure mooring lines, ropes, hawsers, or cables. Bitts are carefully manufactured and maintained to avoid any sharp edges which might chafe and weaken the mooring lines. ==Use== Mooring lines may be laid around the bitts e...
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http://en.wikipedia.org/wiki/Bitts

posts mounted on a ship for fastening ropes
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http://phrontistery.info/b.html

posts mounted on a ship for fastening ropes
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http://phrontistery.info/nautical.html

• (n. pl.) A frame of two strong timbers fixed perpendicularly in the fore part of a ship, on which to fasten the cables as the ship rides at anchor, or in warping. Other bitts are used for belaying (belaying bitts), for sustaining the windlass (carrick bitts, winch bitts, or windlass bitts), to hold the pawls of the windlass (pawl bitts) etc....
Found on
http://thinkexist.com/dictionary/meaning/bitts/
Bitts noun plural [ Confer French
bitte , Icelandic
biti , a beam. ...87.]
(Nautical) A frame of two strong timbers fixed perpendicularly in the fore part of a ship, on which to fasten the cables as the ship rides at anchor, or in warping. Other bitts are used for belaying (
belay...Found on
http://www.encyclo.co.uk/webster/B/59

On a sailing ship, bitts are perpendicular pieces of timber in the deck of the ship for fastening ropes to, and for securing the windlasses and the heel of the bow-sprit.
Found on
http://www.probertencyclopaedia.com/browse/RB.HTM
No exact match found.