day tides is good
if you want a proper boating app tho get;
BOATIE
It gives you
tides
weather - including inshore forcast for next 24 hours, and also a synoptic chart
navigation - it gives you you gps position, COG & SOG and you can enter a waypoint to find out distance and bearing
rules of the road - day shapes/night lights on boats sound signals
weather terminology
beaufort wind scale
lunar calender
code flags (a-z)
VHF channels
IALA buoyage
and this is all for £3.99 may be even cheaper now
and then one other app is ichart, this app is basicly admiraty charts on your phone, iv got anglesey, and that cover the llyn peninsuala all the way to the great orms head, all together 16 charts.
that one is the most expensive at £40 but it shows you position on the chart and you can set waypoints too, and iv tested it and its pretty accrurate

