We would like to share the findings on this important question from an international research report:
The instrumented vehicle study conducted by TUV and DLR (Germany) and Virginia Tech Transportation Institute (the USA) was designed to be comparable to the instrumented vehicle study conducted in the Netherlands by TNO (Vonk et al., 2007). The effects of driving with a navigation system on driving behaviour and on workload were investigated in a real life drive or driving situation.
The survey shows that in all countries a majority of the users of a navigation system indicated that they feel less stressed when they use their navigation system.
The users of a navigation system indicate they feel calmer in their car when using a navigation system while driving.