But he said to them, "I AM. Don't be afraid."
And straightway the boat was at the land whither they were going ... "Straightway" is a far different thing from "instantaneous," and commentators have thus concluded that no further miracle is in view here. However, this sign is a whole complex of supernatural occurrences: (1) Christ's knowledge of the disciples' condition, (2) his "seeing them" at night in a storm (Mark 6:48), (3) Jesus' walking on the sea, (4) Peter's walking on the sea, (5) Christ's rescue of Peter, and (6) the sudden cessation of the wind.  This interpreter supposes that it is fully in keeping with the whole episode to construe this place as teaching that the boat instantaneously, or nearly so, came to its appointed haven.  One more supernatural element in an episode with so many others could do no harm.