You can also try clearing the Navigation fault from the test settings menu but you do need to be stationary to do this.
The Navigation error could also be related to the strength of the GPS signal. The GPS unit is in the base of the roof aerial and can be prone to erosion, as I found out shortly after getting RoScoe. The Navigation fault occured more frequently and eventually changed to a no GPS fault. We had to fit a new Fakra connector (at the base of the aerial on the inside of the roof liner) which was a right pain in the rear end but did solve the problem.
We still get the odd Navigation fault but just clear it from the previously mentioned test settings menu if it doesn’t reset itself.
Hope yours proves to be just an intermittent issue 🤞
MG no mods but flaps and a lovely new RS knob
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