It could actually be very simple. At power on the coordinates are zeroed, but "fire" is not allowed until coordinates are adjusted again. This prevents the orig

It could actually be very simple. At power on the coordinates are zeroed, but "fire" is not allowed until coordinates are adjusted again. This prevents the original situation, but allows a tactical decision like "fire on own position" to be executed with at least as much speed as any other targeting decision. Firing at power on is an implicitly optimized UX for firing at the default position, and there is no reason for any target to be favored in this case.