There was a spysat mod for SH3 which showed pretty much all traffic all the time
Could probably be done in SH5 though may take longer as so many diff elements to the campaign files
Pick a mis file from a project folder
Total Germany in this instance
Silent Hunter 5\data\Campaigns\CampaignProjects\Total_Germany
Open any mis file in notepad
Will use convoy
The bits you are looking for are
ReportPosTime=3606
< these figures differ for each convoy entry
ReportPosProbability=60
< these figures differ for each convoy entry
Change to
ReportPosTime=5
< will update map position every 5 minutes
ReportPosProbability=100
< will provide an update 100% of the time
Change them all and save
Then repeat for Taskforces\Traffic \Uboats and Wolfpacks
Then you will need to do the same to every other project folder
And other nations will attack each other only if in render range
Outside of that they are just computations