Targa PNA-M4320T User Manual And Service Information page 54

Navigation Device PNA-M4320T English
Here you will find the following items:
Alt. route
With this option, you can choose to block the calculated route for a given
distance (e. g. 0.5 mi) and force an alternative route. Simply tap on the icon
which shows the desired distance. Your route will be recalculated, and the
previous route will be discarded for the given distance.
53