I have a 2018 RT. I use the Genius Maps that I purchased for my phone, it's ok. You can run your phone in airplane mode for this app. It converts the phone into a standalone GPS device. My biggest problem is, when I plug in my phone in the frunk of my bike and plug it in, the charge off the bike is't enough to keep the phone charged. You have to turn on your location on your phone, and my LG just can't keep up using the Genius Maps. My phone will last for about 2 hrs max, and i get a message on my phone saying, phone is overheated and is going to shut down. My phone gets very hot to the touch. So that being said, I think I will purchase the TOMTOM Rider 550 and mount it to my bike.
I am open to some suggestions on what i can do, to improve my current situation.
Blessing