MrDiver

This is a comprehensive set of tools for dive planning in the UK. It includes listings of recompression chambers and coastguard stations. It has a number of calculators including tides, moon phase, spring and neap tides, sunrise and sunset times, gas mod, gas blending and decanting. There is also a simple compass and distance navigation tool and a means of recording the service intervals of your diving equipment. Finally there are some animated knots to be tied.