Any way to verify firing solution without map contacts on?

[Drakken]

Without map contact updates on, we all know the attack map is nigh-on useless - especially when the U-boat remains in motion after firing. That being said, do you expert Kaleuns here have other methods to pre-check whether your firing solution might reasonably hit its target before firing?

One visual cue I use is the trail bubble when firing my torpedo when at a narrow gyroangle. I visualize the distance with the target and extrapolate if the torpedo would hit it. However, that can only be done after firing.

Thanks!