I wondered the same thing. I got it as an option in my 2013 350TS. In my opinion, it is not worth the month. Three reasons:
1. It's a Clarion Add-on and Clarion has no idea how to make a GPS system. Many software problems.
2. It isn't designed with RVs in mind and takes you on narrow dirt road even when it say it won't.
3. If you have the GPS on, you can't have the rear view camera showing your toad.
Even though I have the GPS option, I bought the rand mcnally GPS to put on the dash and have my screen showing the toad. The new GPS is worth it, in my opinion.