Not sure what you mean, actually. Navigate? You mean pressing the microphone button and saying "Let's go home", or some other kind of navigation?
Route planning typically happens when stationary — or if you have passengers, they'll obviously use the systems onboard (or on their personal devices) to do navigation.
But if you're driving alone, and no-one else is navigating for you… you'll have to stop.
...unless you have physical inputs, in which case you just have two or three glances at the screen, each quicker than the mirror check i know you're doing every few seconds.
the problem isn't that you're doing something with your free hand and sparing some mental capacity--else the manual transmission would be outlawed--it's that if you have a poorly designed car, you have to look away for long enough to lose track of what's happening around you.
good on you for realizing when you can't safely operate your car. but me, i just bought a car i can operate safely.
If it would come to that, I would just not do it. It would be a peripheral activity anyway, if it's not afforded by my steering wheel or voice controls. So, yes, I would stop to navigate that. Not sure what that would be, in your car? In my car that might be something like planning the charging for the next night, or unexpectedly running out of battery and planning a detour? Very rare.
Route planning typically happens when stationary — or if you have passengers, they'll obviously use the systems onboard (or on their personal devices) to do navigation.
But if you're driving alone, and no-one else is navigating for you… you'll have to stop.