I have St Helier, Bouley, St Caths, Ecrehous and Minquiers set as my 'favourite locations'.
Some info on it here:
http://itunes.apple.com/gb/app/marine-tides-planner-10/id347529832?mt=8
I have those as faves too - and I haven't even been to the channel islands before. Not until end of November that is, when Im coming over for a bit of guided fishing with Steve Mullins.
But thats the beauty of this app. I was able to check exact sizes and times of tides of the places I might be fishing well in advance, which enabled me to try and pick a worthwhile time to make the trip. I was also checking out tidal movements on West coast of Ireland - but plumped for Jersey this time. One of the best features I like is the tidal speed. If you believe that the Bass are more on the hunt as the tide is moving at full speed (there prey being chucked around a lot more in the extra current making them more vunerable) you can actually get the exact times when the tidal speed is at max. Obviously this is never just after or before high and low tide where the sine wave flattens out - so you can kind of guess it any way but its kind of cool to have it at your fingertips.
I have the Dorset coast as my main faves, inc. Poole, Swanage, Mupe Bay, Portland, Chesil Cove and Chesil Beach. Yet my only actual tide timetable from down there is from Poole. However I can work out the tides for any section along there by just looking on the map and seeing the difference between adjacent tide points. It's actually designed for sailors but works a treat.
Just tried to see if it work from Itunes on the desktop but computer says no! However you can get it for iPad (wouldn't fancy one of them in my wader pocket though).
This probably seems like an advert, but Im smitten - it just does it so well - Ive even checked out US eastern seaboard - stripers anyone? In my dreams -but you never know - the kids are going to want to go to Disneyland Florida at some point - and with this app I can make sure we go the right week!