The digital readout was probably the Gyro angle indicator on the scopes/TBT screen
If I understad it right, what you want is a way of quickly converting relative bearings to true bearings (So you can set your course to the target you just located) right?
That's difficult, as the only thing that gives you instant readout of that is a compass with an internal bearings division, like the one on the task bar but much bigger. In SH3 it was possible to add enlarged gauges, but in SH4 things seem to be much more complicated. There was however some time ago a mod that added such a compass to the radio station. Do a search for it and see if it works for you
