CALMAC’S Gourock-Dunoon service is on yellow alert today due to reduced visibility.

Sailings are liable to disruption or cancellation as a result of the conditions.

The route has also been reduced to a single vessel timetable due to a technical issue impacting MV Argyll’s starboard engine.

An update on the ferry is expected at 2pm today.

Sailings from Gourock at 1:05pm and Dunoon at 1:35pm today will be cancelled to allow MV Ali Cat to refuel.

Until July 25, passengers must purchase a ticket before boarding at Gourock – with CalMac recommending online booking to reduce delays.