All the maps on this website are available as georectified .pdf files. These can be read in the field (without cell phone tower reception) on your smart phone with the Avenza.pdf app. It is downloadable at
https://www.avenza.com/avenza-maps/ 
This application takes my maps and puts a dot on your cell phone or tablet screen to show you where you are as you explore the areas covered by my maps. The free version only lets you load 3 maps a at time.  To use this tool follow these steps
1. Download the map you want from my web page to your smart phone or tablet
2. Download the avenza.pdf app from your app store to your smart phone or tablet
3. Activate the avenza app
4. Upload the map you want into avenza
​5. Enjoy!