[dboreham]

Quick note that at least since WW2 there has been a technique where you know that the enemy is recording the location of something. So you add an offset to the signal they receive. Then they know where the thing is, but actually they do not. This was done with V2 missiles where the navigation system had a tendency to drift slightly one way (forget if it was north or south). British reported V2 strikes as occurring where Germany would expect them to occur if that navigation drift hadn't happened. Result Germans never fixed their navigation system.

[YawningAngel]

I think the navigation system was OK, we just said the impacts were further West than they actually were so the V2s fell on East London instead

[nswango]

To be pedantic: I think the actual story is about V1 drones. They did not have a navigation system as such, they were just aimed in a certain direction and with the right amount of fuel to fall out of the sky over the target.

The British noticed that V1s aimed at London tended to fall a little short. This would have been to the South and East of London since that's the direction they were coming from. They reported more hits on the North West of the city, expecting correctly that Nazi spies in Britain would let the Luftwaffe know about this.

So the range was decremented further, meaning even more hits on the southern and eastern suburbs, but statistically fewer people killed and buildings destroyed as the mean moved to less populated areas.