I\'ll put in my two pennorth on this.
I\'ll say at the outset that I\'m a relative beginner at this business, having only bought my first boat this year. There are many more experienced heads on this site. Having said that, I\'m much nearer to Bribones interms of knowing what it\'s like to be a beginner wanting to get afloat.
The first thing to say is, just because there is no legal rquirement for you to undertake any form of licence, qualification, training or instruction before you to take a boat out to sea, it doesn\'t necessarily follow that it\'s a good idea to do so.
Your first three priorities when you consider this venture should be:
1.Safety
2.Safety
3.Safety
Otherwise you\'ll be risking your own life, those of anyone who comes out with you, and potentially those who would have to come and rescue you if you get into trouble.
IMHO, when you count the cost of getting afloat, you need to factor in not just the cost of your vessel and berthage/slipway charges, but all that is necessary to do it safely. This would include (and this is not a comprehensive list - approx costs in brackets):
Lifejackets (£35 each)
Flares (£30)
VHF radio(£90 at least - plus the cost of a 1 day course to get a licence to operate it)
GPS (£120+)
Fishfinder/depth sounder(£80+)
Anchor/chain/warp
All mooring ropes etc
Charts of your chosen area (£10-15 each)
Third party liability insurance as a minimum (I pay for up to £2,000,000 of cover, the current maximum payou if you were for instance to run someone down and disable them is £3,000,000).
I would also include the cost of some sort of instruction to help you make the most of the above, and to ensure you\'re not a dangerous menace to others on the water (do you know the colregs?). Handling a boat isn\'t just a question of steering - I\'ve made the beginner\'s mistakes relatively recently so I know. I took the RYA level 2 powerboat course which will at least teach you how to launch and recover safely, how to steer, pick up a mooring, recover a man overboard, and a bit about tides, pilotage, navigation and choosing a boat for your purposes - this for instance was where I learned how much fuel I could expect an outboard motor to use.
You may get some of the above with your boat, some could be acquired secondhand, and if you have a mate who\'s willing to show you, you might get away without the formal instruction. I wouldn\'t however entertain the notion that you\'re going to get afloat on the sea in safety on £500.
Sorry if I seem to be a bit of a killjoy, but I rationalised all this by saying it was all part of the initial startup cost as it were. I could have had a lot of charter trips, and taken a couple of mates with me for what it cost me to set up my boat.
Bloody good fun though.