Breadcrumb Home Plan Your Visit Maps & GIS Using Avenza Find your location on Park maps using Why Do We Recommend Using Avenza Maps? View official County Parks Maps on your mobile phone. It's free and works with Apple and Android devices. See your GPS location offline. Neighboring agencies including Mid-Peninsula Open Space District and East Bay Regional Parks also post their maps on Avenza. And it's pretty easy. Step 1: Go to the Apple App Store or Google Play to install Avenza Maps. Allow GPS use. Click the X in the upper left, or create an account (not necessary). Step 2: Click on the store icon at the bottom of the page. Step 3: Enter the name of your park of interest, or enter a location if you're already at the trailhead. Step 4: Identify the map you're looking for, then click "Free", then "Download". Step 5: If you're in the park, you will see your GPS location (blue dot), and going offline will not affect your map.