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Draft is the distance between the waterline and the lowest point of the ship. It's the minimum depth of water required to stop it fouling the bottom.Air draft is the height from the waterline to the highest point - the clearance required to get under a bridge.
By the by, I've just read, in the UK Defence Journal:"HMS Dauntless temporarily reduced to harbour training ship""It's no secret that HMS Dauntless has endured the most issues relating to the widely reported propulsion issues currently found in the Type 45 Destroyers. While a remedy is being worked on and the vessel will eventually return to operations, this will not be for a few years yet.A parliamentary written question has confirmed what many have feared, that the vessel will not be leaving Portsmouth for some time."Scratch another escort vessel....BobG