Method setSpeed

src/Savegame/MovingTarget.cpp:134–141

* Changes the speed of the moving target * and converts it from standard knots (nautical miles per hour) * into radians per 5 in-game seconds. * @param speed Speed in knots. */

 * @param speed Speed in knots.
 */
void MovingTarget::setSpeed(int speed)
{
	_speed = speed;
	// Each nautical mile is 1/60th of a degree.
	// Each hour contains 720 5-seconds.
	_speedRadian = _speed * (1 / 60.0) * (M_PI / 180) / 720.0;
	calculateSpeed();
}

/**
 * Calculates the speed vector based on the