Opencpn will display all that useful data for you, including rate of turn which can be handy if the ship is in the middle of a maneuver you could be interested in >>And a bit of practice? In any sort of reasonable seaway i reckon I get within one or two degrees. Sometimes it takes a minute or two to settle.
The compass and eyeball confirm what the AIS is saying.
Our AIS is quite clever and tells us time to cpa as well a whole load of data I don’t normally bother about.
AIS [OpenCPN Manuals]
Latest version also shows last position received plus an estimate of real position based on last data received, handy with class b where it can be a while between messages received though obviously not to be completely relied on as it's a guess from previous data.