Tasting411® in Napa Valley lists the winery tasting locations in the Napa Valley region. Other Tasting411® apps track over 3000 wine tasting rooms in the US and France. The apps sorts wine tasting rooms by distance and direction (if available on you smartphone). You can sort by closest, by Appellation, town, or search for a specific winery. Once you located your next choice you can use Google Maps to track your route, click to call, see their website or Twitter feed. You also sort by picnic locations or offered discounts and at the end of the day you can sort by tasting rooms that stay open late. Each app covers a specific Tasting Region that you would visit in one day.
The Napa Valley app can also sort by Charging Stations, Tesla and EV.