This listing is unbiased. 5360360 Twice weekly ferry service from Plymouth to Santander, Spain in Mar-Nov. 2 nights on board. Either boat can be chartered for a day.
Departures are weather dependent.
However, the more time spent at sea, the more you are likely to see, so day charters tend to yield better value for money. Scilly pelagics are a relatively new event. Prior to 1996 local birders only occasionally joined sharking trips. However, in 1996 a presumed to be Fea's Petrel was seen, with a further three sightings in 1999. Also, in 1997 Wilson's Petrel were discovered in Scilly waters.