RUb1.43 to RUb1.44: map contacts

[Enfilade]

For my part, I am now 'ignoring' any single ship radio contacts displayed on the map. Incidentally, this is the policy of 21st Flotilla, which I have just joined. I will only pursue single ship contacts if I detect them on the hydrophone or visually. It's a much better challenge imho. This hasn't stopped me from sinking lots of single merchants in my current patrol (Dec '39).