Hello Jackal,
There is the Fawley terminal (is it Exxon?), upstream from Calshot Castle?
The channel is apparently dredged to 12.6m, so that depending on the tide, with an additional 0.50 to 4.50m, supertankers can sail the Thorn Channel and Calshot Reach to the terminal?
Latitude is at the low limit of VLCCs (>200000t), that is, above Suezmax dimensions. It seems probable that the dredging is a direct function of the maximum envisaged draught. The waterdepths due to tide that can be added to the depths on the chart vary from 0 to 4.50m, as described in the picture (from the Solent chart SHOM(FR) 6560 - Solent Partie Est - Spithead).
Perhaps is there someone from the area who can answer this?
Unloading Latitude to gain 3m would give an interesting challenge indeed, as soon as tidal streams will be represented?
Regards,
Luc
Edit, thank you muns for the answer given before the question!
Also, Stena Normandy (now Normandy of Irish Ferries?) has a design draught of 6.10m, Stu was apparently 10cm wrong?