A drift dive is a scuba dive in waters where there’s a tide or current flowing. This current will be strong enough to push you along in the water. The fun lies in going with the flow! If you’re diving in a current of half a knot or more, then I’d class this as a drift dive. But a dive where there’s a ‘drift’ may not always be about the drift itself. You may be scuba diving to see sharks that happen to be there because of the strong current. In which case you may not want to be drifting in the current.