The Garmin 890 is the "New" Rolls Royce of Garmin RV GPS. If you don't mind "last year's" Cadillac, see this thread for a less expensive option:
https://www.jaycoowners.com/forums/f...why-76891.html
Granted the 760, 770 etal have only 7 inch screens but is the one inch going to matter?
You can find used ones reasonable on eBay.
Murff