In amongst all the usual equipment on @HMSPuncher’s bridge is this beauty. It’s a precise, real time, sea state measuring device. The further back the drinker has dared to peel the cling film on their “hot wet” (cup of tea or coffee) the flatter the sea is 😺 #1PBS pic.twitter.com/xlpNY2Tlac

— Ship’s Cat (@R08Cat) February 12, 2020