in addition to the above post by nabi
i use route converter (free)
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easy to plot a route or waypoints. then save as igo8route (kml)
for primo ,place saved file in content > userdata > route . you might have to create the userdata & route folder if they dont already exist.
run primo and import route. once loaded its probably best to re save route .
another option is to use Everywan remote support
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a great tool for controling your device from a pc , creating a good sized mirror image on screen and with mouse control
( connect via usb)