During a typhoon, boats take shelter in the anchorage.
Written forms
船だまりUsage53%
Standard modern spelling using 船 and kana だまり.
船溜まりUsage26%
Full kanji spelling; 溜まり is a common way to write だまり.
船溜りUsage21%
search-only kanji form
Search-only variant with 溜り instead of 溜まり.
舟溜まり
Uses 舟 instead of 船; both are acceptable for small boats.
Etymology
Compound of 船 (funa, 'boat') and だまり (damari, 'pool, puddle, gathering place'), the nominalized form of たまる (tamaru, 'to collect, to gather'). Literally 'boat gathering place'.