I use it as well as a couple of others. I think its very accurate as far as forcasts go. The boating forcasts are based on wind and swell. I use the premium account and you get water temp, current charts, wind charts and lot more. The wind charts are very handy, shows the different winds at different depths. Well worth the money.

Dont bother with the others (seabreeze etc) unless it is to check basic weather ...info is much more accurate and you can choose off shore to get an idea of what it will be like out here and you can set them as your favourites

I also use Premium ( $10 or so a month ot you can get annual subscription).  Have saved it in fuel by not going out when seabreeze etc say it is good (been out and had to turn aound as the other sites said it would be good). You get the phone app .

 And reckon it is worth every cent - my mate on his 42 lagoon often rings me on sat phone for buoyweather forcasts and reckons they are really accurate  - love the way you simply place the cursor on the map and it gives you seven day forcasts for that area 

 Yep very accurate. As above premium membership worth every cent and its awesome for offshore forecasts. I have mates who are pro crayfisherman and they use it too

I used to use buoyweather (Karratha area) but found this to be better

http://www.windfinder.com/forecast/legendre_island