Answer: buoys

AnswerCrossword Clue
BUOYS

Channel markers

BUOYS

Gulls' perches, often

BUOYS

Harbor markers

BUOYS
Some meteorological data collectors
BUOYS
Keeps afloat, with "up"
BUOYSLifts up
BUOYSHolds up
BUOYSFloats in the harbor
BUOYSElevates
BUOYSLifts, as spirits
BUOYSRaises, as spirits
BUOYSGives a boost to
BUOYSThey bob in the sea
BUOYSChannel markers.
BUOYSChannel guides.
BUOYSFloats.
BUOYSFloats
BUOYSChannel markers in harbors
BUOYSWarning floats
BUOYSSome have bells
BUOYSEncourages, with "up"
BUOYSThey may have bells or whistles
BUOYSThey barely keep their heads above water
BUOYSKeeps afloat
BUOYSLifts
BUOYSSea bobbers
BUOYSOcean channel markers
BUOYSHarbor floaters
BUOYSPartners of "gulls" in maritime jokes?
BUOYSChannel chimers
BUOYSSome nuns
BUOYSRegatta markers