The main thing you'd be missing out of with a digital heading is the 'nested compass' rose we have from SH3.
It's constantly valuable for me to be able to set a heading based on cardinal directions or related to a bearing from my sub as we can currently with the outside NSWE compass and the inside sub bearing compass. Or even being able to see at a glance that behind my left shoulder is West or something. Losing that functionality to conform to the new digital ribbon UI style would be a shame.
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