I used a Garmin 7200 Street Pilot for 7 years and loved it. I recently "upgraded" to a Garmin RV 760 LMT GPS. The first time I had an opportunity to use my new GPS was a trip to Yellowstone/Tetons that I've made many times. Going from my home in Helena, MT, the unit missed 4 out of 5 junctions and on the return trip again missed all but one junction. I'm wondering if the roads in the two parks I visited are not available to the Garmin folks. I plan to sell this new GPS and purchasing something that might work. YMMV, JMHO.