舰

Boat radical on the left - pictograph of a small dugout canoe with a bench and prow. Indexes 舰 in the watercraft family with 船 ship, 航 to sail, 艇 launch. The radical is the literal subject: a 舰 is a particular kind of boat - an armoured warship - and 舟 anchors that meaning.

Right side 见 supplies the sound (jiàn → jiàn, exact match). 见 also adds a distant flavour of 'observation, watching from a distance' that suits a warship on patrol. Replaces traditional 監 in the right slot during simplification - a streamlined modern phonetic carrying the same reading.