Not many people choose to chuck themselves into the freezing cold sea at dawn. Even fewer do it to catch a perfect shot on their iPhone – no, that's not because iPhone's don't like swimming, it's because, well, most of us can't get out of bed in the morning.

Armed with just a surfboard and his mobile (complete with a handy waterproof case, of course) Aussie seascape snapper, Ryan Pernofski, has put together a photo journal of his best shots of the ocean, complete with tips to help you boss wavy shots in just the same way, should you feel the need.

Salt & Light (published by Harbour Publishing House) is available to buy from 1 December for £20, amazon.co.uk

For more information visit saltandlightbook.com