Friends, many people asked me that how offline command of google assistant work..so you have to simply follow the steps 👉 try to command google assistant to "NAVIGATE ME TO .....( your destination) " then it will direct access navigation process .... or you can start it manually from map ..... then TURN OFF MOBILE DATA... AND COMMAND ASSISTANT ONLY and EXACTLY THOSE 👉👉 " HEY GOOGLE... then say "WHAT'S MY NEXT TURN " // " HEY GOOGLE....then say " WHAT'S MY ETA" // " HEY GOOGLE...then say " CANCELL MY NAVIGATION " ....THANK YOU 🙏