I've made a prototype of an educational navigation simulator.  You have to steer a cargo ship into the dock at Southampton using a very small bit of a UK Hydrographic Office chart.  It's harder in the fog like in the second screenshot.  I made this at Taunton Coderdojo.  It was an idea from the coders who volunteer at the Coderdojo and work at the Hydrographic Office in Taunton.  It's been a rush to get the protoype ready for Coolest Projects in Manchester on 2 March.

I've debugged Water the Crops.  The camera was shaking during the harvest animation which took ages to solve (child of umbrellas crashing into umbrellas).  I've also added a number to show you what level you're on and tweaked the power and rain settings to make it more playable.