There was only 1 contact if that's any help .

I ll try to find a one contact situation then. You havent been in multiple contact situation yet? There are some historicals:)

Try TDW's torp tutorial as it has one ship closeby and you start submerged. That is where I did my testing. I did not mess with different depths.

I just had time to do a few more tests of this.

With only these mods enabled:

My soundman is doing 360 degree sweeps while following his contact at periscope depth, 50m, 100m, 150m all on the same single contact. cancelled his order to follow and re-ordered him at every new depth. Used TDW Torp Tutorial as the mission for the testing.

Just tried it again on a warship , works perfectly .
Campaign = North western approaches , multiple warships (only 1 warship moving) .
Click on hydrophone and rotate hydrophone to warship sound contact .
Press 0 (zero) on keyboard .
Exit the hydrophone .
Hydrophone needle sweeps back and forth .

''You can order the sonarman to follow a contact by either
pointing the hydrophone needle towards a contact
or looking at a contact at the UZO, Attack or Observation periscope ''
Sobers comment''then exit out of the hydrophone to see the needle sweep back and forth"

I just repeated my tests on a warship contact using the cornered giant mission. Same result. I lock the soundman onto the contact with the zero key, and then when I leave the sonar station he follows the target but the needle continues to do 360 normal sweep. This occurs at all depths, with only the 3 mods I listed earlier.

I also tried it with NewUIs 7.4.2 since so far I had only tried 7.5.0. Same result with both builds.

I dunno .

Could this somehow be .net framework related Tscharlii ?

Ok I can try but it seem you have tested throughly anyway. I kind of resigned and use it as it is. It seem to work. I kan go to the mission you mention and time updates /when he assumes closing /moving away etc. I m not sure same results should occur without REM but thats the closest I can do to test functionality. Unless Sober is kind and do the same:).

Ok , it obviously doesn't work in single missions . Works in my campaign though .

have to reset all my settings then I guess..well ok I ll give it a try.
Anyway I got contactupdate everytime it swept over if it had changed position. after 3 mins I got info closing.

Tried deleting SH5 folder in my documents but same result.

Hmm so it doesn t work for you either in single missions thats weird. I started campaign after removing SH5 folder, and just dived outside bunker. maybe not best place but found a contact. Still swept 360. As for now I just accept it. It works just with 360 sweeps and I obviously get slower updates. On the con side I guess I still monitor 360. (maybe it does that anyway I don t know)
Regards

First thing I did after installing Realistic Hydrophone was to start a new campaign and play. For me, campaign or single mission, the result is the same. If REM is installed, the needle does not track back and forth as it should...

I will double check this when I get home from work this evening.

There is an option in OptionsFileEditorViewer
When the sonarman is ordered to follow nearest contact this is the maximum range from the sub the contact can be (in meters)
DEFAULT=7500.0 Meters

@Sober

Good idea, but the ships I did my testing with (TDW torp tutorial and the Cornered Giant mission) are well within the default 7,500 m range, so I dont think that is the solution.