Ferry services can sometimes be delayed or cancelled for a number of reasons, like high winds.
If you plan to take a ferry trip, you should check to make sure your journey is still scheduled to go ahead.
Visit the Caledonian MacBrayne (CalMac) website's service status page to see which of its services are running, delayed or cancelled.
Argyll Ferries also has a service status page for its Gourock to Dunoon service.
If you're travelling with another ferry operator, contact them for service information.