unitSystem
UnitSystem to be used within TomTomNavigation.
Once set, it is propagated to other components (e.g. GuidanceEngine) and is used for the generation of guidance announcements.
UnitSystemType.Dynamic is resolved based on current location country:
for "USA" and "PRI" it will resolve to UnitSystem.US
for "GBR" it will resolve to UnitSystem.UK
for other countries it will resolve to UnitSystem.Metric
The default value is UnitSystemType.default.
Throws
if the instance of TomTomNavigation has been closed before.