How to keep the screen from going blank or locking for particular application Edited question:

Google Navigate app does have the logic to keep the screen from locking or backlight from switching-off, but a corporate BYOD software suite, I've had to install as my employer's policy, seems to lock-screen if an 'unknown application' is keeping screen unlocked/lit with no other activity detected (touch mostly!), after a timeout. Navigate is not on this software's goodbooks... So I was wondering if there is any app that can help me keep the backlight on and avoid the screen locking for google navigate ? 

I am on Android JB 4.2 if that matters.
It's odd that it happens. My last few devices always stayed on while Navigating, when Navigation was a stand alone app and now that it is part of Google Maps. You could go to Settings > Display and turn the screen timout off. Double check the settings in Navigation. 

Alternatively  Screen timout toggle  is an application on the Play Store that seems to be what you are looking for.