Free sat nav for Android car head units, that also runs on Android Auto. No ads, no account and no tracking. Made by one person in their spare time, and a lot of it comes from your feedback here and on Reddit.

⬇️ Download the latest version: install the APK, and the app updates itself from then on.

💙 Support development: totally optional. The app stays free.

• Smooth 3D map with buildings, landmarks and trees, and optional 3D hills
• Your locator: a 3D car (saloon, hatchback, estate, SUV, pickup, van or sports) in any colour, an arrow, or your own picture
• 2D / 3D view, remembered between drives
• Day, night, auto and headlight-linked themes, plus satellite view
• Your zoom and North Up are remembered, and you can set your own default zoom
• Traffic overview when you're stopped (can be switched off)
• Junction close-ups at exits and slip roads

• Routes with live traffic. With both keys added, new routes are asked of TomTom and Mapbox, and the quicker one is offered first
• Offline maps and offline routing for every country, several areas at once. Big countries can be downloaded a region at a time (a German state, an English county...), and the app suggests the area you're in
• Lane guidance on the turn card, plus a lane sign over the road at junctions
• Speed limits, speed cameras, average-speed zones and stop signs, with spoken warnings
• Flock and other number-plate (ALPR) cameras shown on the map (can be switched off)
• Faster-route suggestions while you drive
• Avoid tolls, motorways or ferries, or tolls only in chosen countries
• Lorry (HGV) routes: enter your lorry's height, width, length and weight, and routes avoid low bridges, weight limits and lorry bans, with a lorry check on each route, warnings for limits ahead, and lorry parks along the way
• Electric car planning: battery level, charge at arrival and charging stops, live charger availability, and Charging in place of the petrol button on the map page
• Live fuel prices in the UK, France, Austria and Germany, plus E85
• One-tap stops along the route: fuel, charging, coffee, food, services and toilets
• Report police, crashes, hazards, broken-down cars and mobile cameras, on the head unit, phone or Android Auto
• Voice guidance with or without road names, km/h or mph, 12 or 24-hour clock
• Move the speed limit and speedometer to the bottom, middle or top of the screen

• Full Android Auto support, with the same map page as the app, and search and reports from the car screen
• The map on your driver's display (the screen behind the steering wheel), on cars whose Android Auto offers it
• The next turn in the notification, for car launchers and smartwatches that show navigation notifications
• Send a destination from your phone to the head unit
• Remembers where you parked (on the phone), with prices and opening hours for car parks at your destination
• Resumes your trip if the head unit restarts mid-journey

1. Download the APK from the download page and open it.
2. Allow installing from unknown sources if it asks.
3. Open Horizon Nav and follow the setup: location permission, units, and your keys (see below).
4. For no-signal driving, download your area in Settings › Offline maps. "Near you" at the top of Choose an area suggests your region, which is a much smaller download than the whole country.

Android Auto only lists apps from outside the Play Store once you allow it:

1. Open Android Auto's settings on your phone (Settings › Connected devices › Android Auto, or the Android Auto app).
2. Scroll to the bottom and tap Version about 10 times until developer settings are on.
3. Open the ⋮ menu › Developer settings, and tick Unknown sources.
4. Back in Android Auto's settings, open Customise launcher and make sure Horizon Nav is ticked.

Still not showing? On some phones Android Auto ignores apps installed straight from the APK. Install it with one of these instead:

• KingInstaller: open the Horizon Nav APK with it. This has worked for most people who couldn't get it to show.
• AAEnabler: open the APK with it. If you use AAEnabler, update through it too. Updating from inside the app removes Horizon Nav from Android Auto, so the app saves new versions to your Downloads folder for AAEnabler to install instead.

Phones running GrapheneOS, LineageOS or other versions of Android without Google's own apps may not be able to show it on Android Auto at all. It still works on the phone itself.

The app has no keys built in, so nothing goes through a server of mine. You add your own once, in Settings › Keys & accounts.

Mapbox (needed for the map)

1. Sign up at account.mapbox.com.
2. Open Tokens and tap the copy button next to your Default public token (it starts pk.).
3. Paste it into the Mapbox box. Don't type it in by hand: one wrong character and Mapbox refuses it (error 401).

TomTom (recommended: the best address search, traffic, and a second opinion on routes)

1. Sign up at developer.tomtom.com. On a phone, switching the browser to desktop view helps.
2. Open your dashboard and copy your API key (the default one is fine, with Routing and Search ticked).
3. Paste it into the TomTom box.

Good to know

• Put both in. Search is best with both, and new routes are compared between them.
• Cost: both have free allowances that one person's driving won't use up. Mapbox may ask for card details when you sign up, but you're only charged if you go over the free allowance.
• One key on several devices (phone and head unit) is fine.
• Lorry drivers: add the TomTom key. It's the only online service that checks every measurement (length, axle weight and hazardous goods as well as height and weight).

No account, no ads, no tracking, and no Horizon Nav server. The app talks directly to these services, and only for the feature you're using:

Stays on the device: saved places, recent destinations, your own reports, the trip log and your settings.

Works with no signal (once you've downloaded an area): the map, routes, search for downloaded places, speed limits, speed cameras and traffic lights.

Needs signal: live traffic, online search, weather, fuel prices and updates.

• The APK download stops at 100% and never finishes: this is the browser, not the app. Try another browser, or once it's installed, update from inside the app (Settings › About & backup).
• Blank or black map: check both keys are in Settings › Keys & accounts.
• Mapbox "401": the token isn't being accepted. Copy it again with the copy button. The app tells you what Mapbox says is wrong with it.
• "No signal" all the time, even though there is signal: check the head unit's date and time. When they're wrong, every secure connection fails and looks like no signal.
• Laggy on a slower head unit: in Settings, set Map detail to Lite or Lightest and lower the frame rate.
• Phone getting hot or the battery draining on Android Auto: set the frame rate to Auto (60 uses a lot of battery). The app also draws fewer frames by itself when the phone gets warm.
• Driver's display shows only the app icon: your car's Android Auto may not offer that screen to navigation apps. If it does but causes trouble, turn it off in Android Auto's Settings › Map on the driver's display.
• An area says it "hasn't been built yet": that region's pack isn't ready. Pick the whole country for now, or try again later.
• Spoken directions missing: check your device's text-to-speech voice is installed. If you hear the beeps but not the voice, try Settings › Sound › Voice channel › Media.
• Lorry: "No route found": no route could be found that your lorry fits. Check the measurements in Settings › Routes › Vehicle. Lorry routes are only as good as the limits on the map, so always follow the road signs.

Bug reports, ideas and screenshots are very welcome, in GitHub Issues or on Reddit.

The best way to report a problem: Settings › About & backup › Feedback or a problem. It sends a report with your app version and head unit details, which makes it much quicker to fix. Please include it in your issue.

⚠️ Lane guidance is the hardest part to get right. Some roads line up with the map's painted lanes and some don't, so tell me how it looks on yours.

See CHANGELOG.md for what's changed in each version.

Thanks for all the testing! 🙏