"Head for that mirage"
Navigation is extremely difficult on the Lake. Having such a low flat horizon it is often impossible to determine features from within the mirage at a distance of 5 km. The wind is generally constant in direction which is of some help but wind driven currents of up to 5 km/hr, often hard to detect, can play havoc with navigation.
For small craft it is best to limit travel to around 10km hops. From point to point, landing to re-establish position from a higher (say 3m higher!) hill.
A handheld GPS with storable waypoints is an essential navigation aid both on the Lake and should have to walk out. The information stored on the GPS can later be made available to other adventurers. The Commodore thinks his Garmin GPSII+ is the best toy he's ever owned.