Posted earlier this week, in another thread. Same thing happened to me on the 12th March. Yellow symbol warning then no speed recognition, no Sat Nav (It showed me in the middle of North Sea), no Google Sat Nav or location services or Apps that used this didn't work either, though Waze did work. It then cleared itself 8 days later, 20th March and eveything went back to normal.
In the meantime I booked an investigation at my local Stockport dealer that I decided to keep as hoping they could look back at the history to identify any underlining issues. Just left and they informed me that they have raised a ticket with Porsche who have advised a repair, unsure if this is hardware or software related, I will found out from the dealer in a few days.