The watch this morning started with great visibility and moderate sea. Now in the bay of Biscay, Gale force 8, the sea is a bit lumpy but nice to be heading south. We will be across the bay by tomorrow morning.
We crossed over the shelf and the scientific echo sounder was picking up the depth above.
Evening watch, wind had dropped to a force 3 and no traffic in close proximity. I spent the watch maintaining our heading against the set of tide and leeway and took hourly positions. At the end of the watch, we were filling up a ballast tank and at the same time the ship had a synchronous roll*, this was magnified by the free surface effect** of the half filled ballast tank. No damage done, just anything that could slide, ended up on the deck. In my cabin, the contents of my desk and shelves was on the deck.
*Occurs when the roll period of the ship, matches the wave period
**this effect is best seen when trying to carry a tray of water, as the water sloshes the forces build up causing a bigger slosh, etc.
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