Memorial Day is almost here, announcing the start of summer and putting millions of people on the road for a quick vacation. If you’re opting for a road trip, you’ve probably already got your playlist ready, snacks in the car and your phone charged so Google Maps can get you there faster. Turn-by-turn directions make it easy to avoid traffic jams and road closures during your road trip. But if you’re driving through areas with poor signal, things can get dicey in the blink of an eye.

Without an internet connection, Google Maps can’t help you reroute, search for gas stations or recover from a wrong turn. You’re stuck with whatever directions you started with — unless you planned ahead and downloaded your map for offline use.

Luckily, there’s a smart workaround. With offline maps, you can still access turn-by-turn navigation even when you’re completely disconnected. Here’s how to make sure you’re never lost, even without service.

Want to learn about other Google Maps tips and tricks? Check out how to blur your house on Google Maps and three Google Maps features you’ll definitely want to know.

Watch this: How to Use Google Maps Like a Pro

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How to download Google Maps offline

First off, you won’t download all of Google Maps in its entirety. Instead, before your trip, you’ll want to download a specific area, which could be a city, county or region where you’ll be spending time and might not have service on your phone.

To download a map in Google Maps offline, open the Google Maps app on iOS or Android and tap your profile picture on the top right (you must be logged in to your Google account for this to work). In the menu that appears, tap Offline maps > Select Your Own Map.

Use your fingers to place the map you want to download within the confines of the rectangle border. Use one finger to move across the map, and a two-finger pinch to zoom in and out. As you move around the map, you’ll see how much storage space the download will take up on your phone. Once you’re happy with the area, tap Download. 

Note: Alternatively, you can type a city or other area into Google Maps and then hit the Download button that appears in the pull-up window to download the map offline but this only works on the iPhone.

Read more: Google Maps Cheat Sheet: Most Useful Tricks

You must be connected to Wi-Fi to download the map. If you want to download over cellular, go to the Offline maps page, tap the gear icon on the top right, tap When to download offline maps and select Over Wi-Fi or mobile network. Once your map is downloaded, you’ll be sent back to the Offline maps page, where you can see all your offline maps.

Now you’ll be able to use Google Maps even when you’re offline in the area you downloaded — and in that area only. You won’t get extremely accurate travel times or alternate route options because traffic and other road issues are not accounted for but you will get a general ballpark idea of how long your trip should take. Transit, bicycling and walking directions also are not available offline — only driving directions. 

If you want more tips on Google, make sure to read which Google Home settings you need to change ASAP and our picks for the best Pixel phones.