Crossword Clue:

Big gun on a ship Abbr

AnswerCrossword Clue
ADMBig gun on a ship: Abbr.
HELMBig wheel on a ship
MPHAbbr. on a radar gun reading
USSAbbr. on a ship
BLKDPartition on a ship: Abbr.
HRSBig shots on a diamond (abbr.)