Saving battery in areas with no signal

This page is for hikers, climbers, sailors and anyone walking through tunnels, valleys or remote backcountry where the phone keeps hunting for cell towers and the battery dies twice as fast.

The good news: cell-search is the single biggest battery drain on a phone in motion (~500 mW). The GPS chip itself is cheap (~30–50 mW). Turn off the search and OwnTracks / Overland / GPSLogger can run 12+ hours on one charge while still recording every step.

TL;DR

Disable Cellular Data, leave GPS on. That's it.

Don't use Airplane Mode. Don't toggle Location Services. Just turn off the cellular radio and the rest takes care of itself.

Why not Airplane Mode?

Airplane Mode kills WiFi, cellular and Bluetooth in one switch, which sounds great. The catch is what it does to iOS background execution:

  • iOS aggressively suspends background apps when the phone has no network connection of any kind.
  • OwnTracks (and other trackers) need a tiny amount of background CPU time per minute to record GPS fixes.
  • In Airplane Mode, iOS revokes that background time after a few minutes — even if you re-enabled Location Services manually.
  • Result: long gaps in your route while the phone "had GPS enabled" but the app wasn't actually allowed to run.

Android is more forgiving here, but the safer recipe works on both platforms.

The recipe

iPhone

  1. Settings → Cellular → off (or tap Cellular Data off if you want to keep WiFi reachable).
  2. Leave Location Services on.
  3. Leave WiFi on if you'll pass any saved hotspots — points sync automatically when you do.
  4. (Optional) Settings → Battery → Low Power Mode on. Cuts background activity further; OwnTracks's significant-change monitoring still works.

Android

  1. Settings → Network & Internet → SIM → Mobile data off.
  2. Leave Location on, set to High accuracy (uses GPS only when WiFi/cell are off — you're not paying for cell triangulation anyway).
  3. (Optional) Battery Saver on.

What happens to my route?

Nothing. Your tracking app keeps recording locally. Points are buffered on the phone and flushed automatically when you re-enable cellular or pass a known WiFi hotspot. The route is continuous — no gaps caused by lost signal alone.

The only scenario where you'd see a real gap is if the phone goes flat or you stop the tracker manually.

How long can I last?

Realistic numbers from common configurations (iPhone 12 / 13, fresh battery):

Mode Hours
Cellular ON, no signal area, screen off 4–6
Cellular OFF, GPS ON, screen off 12–14
Cellular OFF, Low Power Mode, screen off 16–20
Power bank (10 000 mAh) attached +30

Numbers go down as the battery ages. If you're heading out for a multi-day expedition, plan for a power bank or — better — a Garmin® inReach® which keeps publishing through the wilderness on satellite.

Common mistakes

  • Turning off Location Services to "save power". This stops GPS recording entirely. Leave it on — the GPS chip itself uses almost nothing.
  • Force-quitting the tracking app. iOS / Android only allow background execution to apps that are running but suspended. Force-quit ends recording until you reopen the app.
  • Leaving the screen on with the map open. The display is the second-biggest drain after cell search. Lock the phone — the tracker keeps running.
  • Turning Bluetooth off. Some setups (Garmin® watches, smart GPS pucks) feed locations to the phone over Bluetooth. Killing Bluetooth there breaks the chain even if cellular is still on.

What if I really need cellular sometimes?

Pop into a high-spot every few hours and re-enable cellular for a minute. The buffered points flush, your map updates for followers, and you can switch cellular back off. You don't need constant connectivity — significant-location updates stay recorded even with cell off.

  • FAQ — general questions about how the platform works, including the short version of this answer.
  • Compatible applications — battery profile per tracking app.
  • Garmin® inReach® — satellite messenger for true off-grid trips.

Garmin® and inReach® are registered trademarks of Garmin Ltd. or its subsidiaries. This page is not affiliated with or endorsed by Garmin.

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