Hard to beat SIRIUSXM with FAMILY RADIO and TRAVEL LINKS for $22 month..
TRAVEL LINK includes great MAPS, WX, and NAVAIDEs.
Wouldn't leave home without it...
We also use GOOGLE MAPS as well - Great tool for zooming down on campgrounds in EARTH VIEW and see exactly how it is laid out. Of course some place have too much tree cover to be very useful but means total shade hehe... When I have alot of time on my hands I have actually used GOOGLE STREET VIEW and gone down new to me ROADWAYs that I have am interested in. I also use GOOGLE MAPS to search for RV PARKS or CAMPGROUND along the routes...
Good use for my VERIZON MIFI UNIT to keep my WIFI tablets going when we are en route. 10-inch screens are much better than cell phone 2-inch screens.
Roy Ken