I have found a number of caches, especially multicaches, which require waypoint projection in order to find the next target. Since a middle stage of a cache is typically hidden, this would either require me to go online and find a website to input current coordinates, bearing and distance (not feasible in the field) or use pen and paper and a number of difficult formulas.
This would be a very useful feature in the Android or iPhone app when adding new waypoints. Does anybody agree?