(to allow for the dive) when the target, for whatever reason, cannot be designated precisely by radar. A target for instance may present too small a signature to be visible on radar (such as the entrance to an underground bunker) or may be indistinguishable in a group of radar returns. The pilot can in this case use a special "boresight" mode that allows the pilot to designate a target by pointing his aircraft directly at it. For a target on the ground, this means entering a dive. Thus designated, the pilot can then begin a climb, lofting the bomb at the target from a distance and regaining lost altitude at the same time. Technology Due to the intense pilot workload involved with flying and entering the window of opportunity, some aircraft are equipped with a “Toss Bomb Computer” (in US nuclear delivery, a part of the Low Altitude Bombing System) that enables the pilot to release the bomb at the correct angle. The Toss Bomb Computer takes airspeed inputs from the aircraft's pitot system, altitude inputs from the static system, attitude inputs from the gyroscopic system and inputs from weapons selectors signifying the type of bomb to calculate the appropriate release point of the ordnance. Instead of triggering the release directly, the pilot instead "consents" to release the weapon, then begins a steady climb. The computer then calculates the desired ballistic path, and when that path will be produced by the current aircraft attitude and airspeed, the computer releases the bomb. During the Second World War the engineers Erik Wilkenson and Torsten Faxén at Saab developed the first bomb sight for toss bombing. It was a mechanical computer that did the necessary calculations. It was first used in the Saab 17 and was standard on all Saab fighters up to and including Saab 32 Lansen. It was also sold to France, Switzerland, Denmark and USA and was used in for instance the Boeing B-47 Stratojet. While deployed in Europe with NATO, RCAF CF-104 fighter-bombers carried a Toss Bomb Computer until their nuclear role was eliminated by the Canadian government effective 1 January 1972. The same computational solutions used in the LABS system are now incorporated into two of the major bombing modes (the computer-controlled CCRP and a dedicated visually oriented "Dive-Toss" mode) of the Fire Control Computer of modern strike fighters such as the F-15E and F-16. As with LABS,