UPDATE February 2004: It looks like the boys have problems getting the boat rented again due to Insurance costs (which are sky high in Northern Ireland for anything with an engine!). But they still do the nights in Sandinos. Check their website for dates.
My mate Chaz (see pic) organises this monthly event together with his mate Jonny. Both take turns DJing, and they always have guest DJ's as well. Great tunes whilst you're sailing to Greencastle and back on board of the Toucan One. Probably the best club night in Derry. Get there early, the boat's not that big and places are limited. And hope for a starry night sky - beautiful. Word of caution: Careful with mixing drink and sailing - you could turn a bit green around the nose ;o) Oh, and the stairs to get down to the bar and back up can be very tricky to master as well after a few pints! Believe you me.
Check their website for sailing dates!