Wreck Bay (Kyles of Bute, Bute side) is a good anchorage out of the current. Anchor in as shallow as draft permits. Can be busy. Holding good in sandy mud.
Caladh Harbout, on the west side of the entrance to L Riddon, is another good anchorage in 3-4m, but is tight when there are >3 boats in there. Holding good.
Rothesay: Anchorage from 250m west of the ferry ramp as far as the yacht club building is good, though avoid the few private moorings there (or use trip line). Holding is OK.

The pontoons in the outer harbour are now in use with power and water. If you want to make an early morning departure this is ideal as there is no need to raise the bridge.
When approaching or leaving give the harbour master a shout on CH12 and they will change the lights if they are able. They are very friendly and go out of their way to help where they can.
If there is noone around the gate code is at the top of the ramp and the Bute Berthing Company office has an honesty box (it's a small yellowish kiosk next to the bus stop by the inner harbour).

I reviewed these notes in August 2022. Most of the prices have been adjusted. The pontoons in the Outer Basin are still not available for use (although they are very close)

The Indian in Rothesay will deliver to the marina. And the Post Office does excellent filled rolls in the morning.

I reviewed these notes in July 2021. The "marina" at Rothesay has troubles and the pontoon in the outer harbour is not available. Port Bannatyne is going strong. Collintraive still has buoys but Kilchattan has no visitors buoys at the moment.

I reviewed these notes in April 2017. The price has gone up a bit in Rothesay whilst they are being held at Port Bannatyne for this year.

Shore power is an extra £2 a day. Buses to Rothesay are every half hour or so.

These notes were reviewed by Don in April 2015. Some prices have changed but little else has. Note that at Collintraive they now have a 60 ton mooring.

The notes for the Isle of Bute were updated by Don T on the 6th March 2013. Facilities for berthing at Rothesay have been improved and the moorings in the bay removed. I have added navigational information for passage through the Burnt Isles where fierce tidal streams can be encountered.