CalMac is due to begin trials of a catamaran ferry to help provide relief cover on its west coast network.

The Scottish government has provided £9m for the nine-month long charter of MV Alfred, owned by Orkney-based Pentland Ferries.

There was a short delay to the arrival of the boat due to an issue with another of Pentland Ferries' vessels.

CalMac said MV Alfred would not be added to its fleet until berthing trials were completed.

The charter includes a crew provided by the privately-owned Orkney ferry operator.

In coming days the catamaran is to be put through tests, berthing at harbours at Ullapool, Lochmaddy, Port Askaig, Campbeltown, Brodick, Ardrossan and