There is no negative renown for not going to your grid. The game would award you 400 renown for reaching & patrolling your grid, however it will not take any away. There is also no renown awarded for manually returning to base/port. It was broken in stock SH3.
If you don't like this aspect of GWX 2.1 you are if course welcome to stay with 2.0 but you will miss some fundamental fixes. Of course, adding the renown back in is easy.
Your call.
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