Intro to Geo PDF Maps - Fremont

February 24 & May 19
Trail Map Clip Art

February 24
May 19
10:30 a.m.-noon

What’s a Geo PDF map? How do you use it? A Geo PDF map is a map you download and store on your smart phone. Use the free app called PDFMaps to view and navigate from the stored map in your phone. Use it on hikes or bike rides to log your distance, start time, duration, and more. You don’t need wi-fi or a data connection once the app is installed. It uses your phone’s GPS feature so it works even if you are out of range of mobile phone service. Meet at the Visitor Center to see a slideshow and find out how to obtain a copy of a Geo PDF map of the Don Edwards SF Bay National Wildlife Refuge. A live demonstration will follow. Led by docent Gregg Aronson. Register at and for instructions on how how download the maps to your mobile device.  Please download the FREE Avenza app from your app store prior to coming to the program.


Visitor Center
2 Marshlands Rd.
Fremont, CA  94555 

Please go to your app store and download the FREE Avenza App prior to coming to the refuge.  There is no wi-fi at the Don Edwards Refuge.