A window is a window is a window – except River Rover Hovercraft windows are very carefully made from toughened glass so they can deal with impacts when the hovercraft has to bash through vegetation, and so that they stay completely clear for many years. The surrounds are mades so that there is no chance of them rusting and seizing up; they even have special vents built into them so that the cabin humidity is controlled and yet water doesn’t get in. Cleverest of all are the smallest “front-quarterlight” windows. They open precisely the right amount to allow a pilot to sense cross winds without being blasted with rushing air.