Doubt you'll like my suggestions ...
I have the MAP on, with volume set to 0 / mute.
And then I use Waze on my phone and do what that tells me. I think Waze traffic data, and where there are roadworks, and mobile speed camera etc., and also the speed with which a brand new road gets included, is better. On that basis you could use Google if that's the preference.
Sooner or later the two will disagree, so that's something that has to be dealt with ... if I go with Waze then SatNav will catch-on fairly quickly ... but Waze has recommended going wrong/long way round M25 before now ... that may well be quicker, but it would require a charging stop ... so that makes for some tricky mental arithmetic especially if it only offers that advice a mile before the M25 junction!