Just got introduced to a great new app, Field Trip, (Apple and Android) that gives you detailed information about roadside markers and other points of interest as you travel along. We can't stop at every highway marker, but we sure are curious about what it is commemorating. This app pulls up the information, picture of the marker and what is written on the marker. It also provides links to more detailed sites. Tried it out today on a day trip in SE AZ and were very pleased with the information. Once loaded you might want to go in and make sure it is only "locating" when using the app. It defaults to bluetooth, unless you disable to only when open. However, there may be times when being notified as you travel along may be preferred.