I was always looking to start a navigation using Google Maps on Android with a just a single click. Of course you can set some presets or even a location, and since a few generations of Google now, there is even a navigation shortcut for your work or home address. But one thing, all these methods were missing: A real one click solution. Every shortcut only gets you to the calculated route, you always have to start the real navigation with another click.
Using tasker, I found a way to finally realize what i needed.
Tasker has support for intents and using the Google Maps-Intent works like a charm.
Create a new task.
Add System -> Send Intent
dfor car (drive)
Take a look the the manual page for all options.