'Anchors Away' is the march of the USN as opposed to the RN and some other Commonwealth navies who have' Heart of Oak'.
When weighing (raising) anchor the sequence is 'anchor aweigh' (off the sea bed), ' anchor clear of the water' (I can see it), 'clear anchor' (nothing entangled, hopefully, like old cable,wire, bits of old cars etc). That really is nautical drifting!
Dick