This in from Wightlink in their own words. Ed
Please be advised that due to essential maintenance needed on St Clare it has been necessary to cancel the following sailings on the Fishbourne-Portsmouth car ferry route on Tuesday 20 March:
From Portsmouth: 1230
From Fishbourne: 1330
We’re sorry for any inconvenience caused by this, and are in the process of contacting passengers booked on the affected sailings.
If you have any concerns about your crossings please contact us on 0871 376 1000 (calls cost 7p per minute plus network extras).
Image: Secret Pilgrim under CC BY-SA 2.0