i believe many have mentioned this fix regarding the map going haywire once navigation start.. howeva i would like to contribute the fix here and i suggest ts can put this temp fix on the first page.
easiest solution is to turn off the mobile data on ur phone b4 u start the app.
if u wan a kinda of permanent fix, and sumhow dunwan to turn off ur mobile data for wateva reason, u can use this method. (need a rooted device)
1) donlod an app call permissions free, available in the playstore market
2) once install, select papago/navitotal app
3) disble the internet connection permission
4) there r few instructions that wil guide u on wat to do n how to lock the permission
5) done, if the permission is successfully disable n lock, ur papago shud work fine while the mobile data is on.
* btw do this on ur own risk, make sure u know wat u do, i wont be responsible for any error that wil come up out of this but i tested it mycef n so far everythg working flawlessly.
my advice is, it is best to just turn off ur mobile data while navigating, be focus on ur driving n ur direction rather then to be distracted by whatapps/any messaging/social app notification.