Yeah I tried marinas.com but was sadly disappointed. Tried google maps, earth, bing maps, etc. but none of them had the important details I was looking for. The idea came about because I found myself coming into unfamiliar marinas, usually in the dark, tired, (you can hear the violins can't you?) and I couldn't find the slip I was looking for. This happened several times and then it struck me to make our own resource since many marinas don't publish their maps for some inexplicable reason. Library has only been up less than a week but, based on the contributions of maps, the traffic, the views and the downloads, I guess it's fixing a problem. Should be easy to manage too since the fuel dock, toilets, etc aren't likely to move very often and thus the maps won't need a lot of updating. I think it'd be particularly valuable in the back of beyond places in the world.