NAVIONICS

I found a free map site and I think that can be useful for looking for new fishing spots for guys That do not have chartploter
http://www.navionics.com/

Have seen it before, i use the navionics gold myself.
pity it dont give coords on screen for where your arrow is pointing

Here is a better link
http://www.chartsandtides.co.uk/try
I downloaded the map myself is fully functional trial
I think that good value for money