MultiUI for SH5
That mod has the SH3 style officer buttons at the bottom that re-add features like nearest contact and follow contact. Along with a lot of other features.
As far as sonarman not hearing things, happened to me last night. He said 'no contact' when in reality I had 3 destroyers 1000m from me SHOOTING me. Guess he couldn't hear their screws over the sound of my u-boat exploding so said 'no contact'.