How Much Battery GPS Tracking Uses on a Smartwatch

Why GPS mode has its own battery rating

Daily use ratings cover a mix of notifications, periodic heart rate checks, and occasional location requests. GPS tracking is different: the watch must keep a continuous lock on satellites and compute position at regular intervals. That sustained workload draws more current than typical operation, so a single number cannot represent both scenarios. The Global Positioning System (GPS) is a U.S.-owned utility that provides positioning, navigation, and timing services, as described by GPS.gov.

Manufacturers therefore test and publish a separate battery life figure for GPS mode. This figure accounts for whether the screen is on or off and whether other sensors are active. When comparing watches, look for the GPS rating alongside the general use rating. The GPS rating is often much lower than the everyday figure, so it is important to check it for long workouts. Apple's watchOS User Guide includes guidance on extending battery life, which typically involves reducing GPS usage, and Wear OS by Google offers battery management features as well.

What drains battery during GPS tracking

The main consumer is the satellite receiver, which must tune into signals from multiple satellites to calculate your position. Many watches also support additional satellite systems like GLONASS, Galileo, or BeiDou to improve accuracy, and some have dual-band receivers that capture signals on two frequencies. Each extra system or band increases the processing load and power draw. The trade-off is accuracy versus battery life, as explained in our articles on dual-band GPS and satellite systems.

Other features add to the drain: the display stays on if you use it to view your pace or map, the heart rate sensor may run continuously, and the watch may be communicating with your phone via Bluetooth. The Bluetooth LE radio is designed for very low power operation, as stated by the Bluetooth SIG, but GPS still requires the main processor to handle location calculations.

• Continuous satellite tracking
• Multi-band reception
• Additional satellite constellations
• Screen-on navigation
• Frequent heart rate sampling

How workout modes extend battery

Smartwatch makers include dedicated modes for long activities. These modes reduce the load on the battery by making trade-offs. For example, a 'GPS only' mode may disable additional satellite systems or lower the sampling rate, meaning the watch calculates your position less often. Some watches offer an 'ultra' or 'battery saver' mode that turns off the display entirely and reduces heart rate checks to every few minutes. These features are not exclusive to one brand; both Apple and Wear OS provide battery management tools, as seen in their official guides. The goal is to stretch the GPS battery to cover an entire marathon, hike, or ultramarathon.

Some watches also let you connect an external heart rate strap, which can be more efficient than using the optical sensor continuously. Our guide on chest straps vs wrist heart rate explains the trade-offs. For the longest events, you might also consider a watch with solar charging, but that is a separate topic covered in our solar charging explained article.

For example, a watch rated for continuous GPS tracking with the screen on might stretch to twice that duration when you switch to a low-power mode that only records location less often. Some watches allow you to customize this interval, giving you control over how much detail you need versus how long the battery lasts. The trade-off is that a track with fewer data points may show less precise path details on a map, but for most distance and pace tracking, the reduction is rarely noticeable. Ultra-marathoners and thru-hikers often rely on these extended modes to ensure the watch lasts throughout the event.

Choosing a watch for long workouts

When you plan to use GPS for several hours or days, prioritize a watch with a high GPS mode rating. Check the specs for 'GPS mode battery life' and see if the watch includes power-saving options. Rugged outdoor watches often have longer GPS endurance than general-purpose models. Our roundups of best GPS smartwatches and best rugged GPS smartwatches compare these figures across many models.

Consider the following when choosing a watch for extended GPS use: a GPS mode rating that covers your expected workout duration, availability of battery saver modes, support for additional satellite systems, and durability in wet or harsh conditions. For eco-system preference, the best Apple smartwatches and best Wear OS smartwatches lists can help you narrow down options.

• GPS mode battery rating
• Battery saver modes
• Dual-band or multi-constellation support
• Water resistance and ruggedness
• Compatibility with external heart rate sensors

Tips to stretch GPS battery during a workout

Once you have a watch, you can use settings to make the battery last longer on a single GPS session. These tactics trade some data richness for extended runtime, but they are worth knowing for long outings.

• Turn off the screen or use a low-power always-on mode
• Disable Wi-Fi and cellular if you do not need them
• Reduce GPS sampling rate if the watch allows it
• Use an external heart rate strap to save wrist sensor power
• Close background apps and turn off notifications

What to pick for your use

Questions

How much more battery does GPS use than normal?

GPS can consume several times the power of typical daily use because the receiver stays active for the entire session. Exact numbers depend on the watch and settings, so check the manufacturer's GPS mode rating rather than relying on the general use figure.

Does turning off additional satellite systems save battery?

Yes, using GPS only instead of GPS plus GLONASS or Galileo reduces the processing load and can extend battery life. The trade-off is that accuracy may decrease in dense urban areas or deep canyons where more signals help.

What is the best mode for a long hike?

Use a battery saver mode that lowers GPS sampling frequency and turns off the screen. This can significantly extend runtime, but you will get a less detailed track. Many outdoor watches offer this option explicitly.

Can I use GPS without a phone?

Yes, GPS is a satellite-based service that does not require a phone connection. As GPS.gov explains, it is a free and open service. Your watch can record your position and track your route even when it is not paired to a phone.