First of all, thankyou very much folks who put this mod together.
It keeps gameplay quick enough for me as my schedule is quite a tight one at the moment. So because of time constraints this mod works perfect. ( I did take the time to read the FAQ, and printed it out as there are some nifty little tweaks that one can make to suit how they like to play).
To add maybe a possibility to the radar issue, I too have had blank radar screens, but only because the time period was early in the war, and those options weren't available. I think it was in '42 at some point where I first started seeing surface radar appearing as an option. Once installed on the boat, it always works unless damaged by enemy action, ie: surface engagement, or depth charges.
Again, thanks for all the efforts.