Do I need a GPS watch?
Not to start: phone GPS is accurate to about 4.9 m in open sky. A watch earns its place for phone-free runs and races. GPS hours, cost per hour and UK picks.
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Do I need a GPS watch for running?
No, not to start: a phone app records distance and pace well under open sky, where gps.gov puts smartphone accuracy at about 4.9 m. A GPS watch earns its place for a runner who leaves the phone at home, races, or trains to pace and heart rate targets, because it shows those numbers on the wrist and reads heart rate as well.
The watch to buy is the Garmin Forerunner 165 at £164.04 on Amazon UK at the time of writing (October 2026). Smartwatch options for everyday wear are ranked in Best smartwatch UK 2026.
| Situation | Need a GPS watch? | Pick | Price |
|---|---|---|---|
| New runner who carries a phone | No | A free phone app | £0 |
| Runs without a phone, or races | Yes | Garmin Forerunner 165 | £164.04 |
| Runs in city centres or under trees | Yes, with dual-frequency | COROS PACE 4 | £229.00 |
| Trains to pace and heart rate zones | Yes | Garmin Forerunner 265 | £297.12 |
| Tight budget, wants GPS anyway | Yes, cheaply | Amazfit Bip 6 | £79.99 |
Is phone GPS as accurate as a watch?
On open roads, close enough. Phones and watches listen to the same satellites, and gps.gov says GPS-enabled smartphones are typically accurate to within a 4.9 m (16 ft) radius under open sky. The same page says accuracy worsens near buildings, bridges and trees, which is where a phone in a pocket or armband struggles most and a dual-frequency watch helps.
No maker on this list publishes a positioning accuracy in metres for its watches. Garmin says its SatIQ and multi-band mode gives "superior positioning accuracy and optimised battery life", and COROS lists an All-Satellite Dual-Frequency mode, but neither puts a number on it, so this post quotes none. The practical gains of a watch are elsewhere: pace and heart rate on the wrist at a glance, no phone bouncing in a pocket, and a phone battery left alone.
What is dual-frequency GPS, and is it worth it?
Dual-frequency GPS, which Garmin calls multi-band, means the watch receives two signals from each satellite instead of one. Gps.gov explains that the GPS modernisation programme is adding a third civil signal at the L5 frequency to enhance performance, and that high-end users boost accuracy with dual-frequency receivers. Running watches with this mode pair the older L1 signal with L5, which helps most on city streets and under tree cover.
The cost is battery. Garmin rates the Forerunner 265 at 20 hours in GPS-only mode and 14 hours with All-Systems plus Multi-Band, 30% less. The Instinct 3 AMOLED 45mm drops from 32 hours to 23 hours, 28% less. Dual-frequency is worth it for a runner whose routes run between tall buildings or through woods; on open roads and parks, GPS-only mode is enough and the battery lasts longer. Apple's rugged option for iPhone owners is weighed in Apple Watch Series 12 vs Ultra 4.
How many GPS hours does a running watch last, and what does each hour cost?
The watches here last 19 to 41 hours with GPS on, by maker figures, and the price per GPS hour runs from £2.50 to £14.86. Compare Electronic's table divides each Amazon UK price (11 October 2026) by the maker's GPS rating from garmin.com, coros.com and amazfit.com, and repeats the sum for dual-frequency mode where the maker lists hours for it.
| Watch | Price | GPS hours | Per GPS hour | Dual-frequency hours | Per dual-frequency hour |
|---|---|---|---|---|---|
| Amazfit Bip 6 | £79.99 | 32 h | £2.50 | Not listed | n/a |
| COROS PACE 4 | £229.00 | 41 h (All-Systems) | £5.59 | Yes, hours not listed | n/a |
| Amazfit Active 2 44mm | £129.00 | 21 h | £6.14 | Not listed | n/a |
| Garmin Instinct 3 AMOLED 45mm | £269.00 | 32 h (GPS-only) | £8.41 | 23 h | £11.70 |
| Garmin Forerunner 165 | £164.04 | 19 h (GPS-only) | £8.63 | No multi-band mode | n/a |
| Garmin Forerunner 265 | £297.12 | 20 h (GPS-only) | £14.86 | 14 h | £21.22 |
Every watch in the table covers a four-hour marathon several times over, so GPS hours matter most for ultra runners and for charging less often. The Amazfit Bip 6 is the value outlier at £2.50 per hour, and the COROS PACE 4 gives the most hours of any watch here. Garmin prices are higher per hour because they pay for training software: the Forerunner 165 includes Garmin Coach plans, a race predictor, wrist-based running power and a Morning Report, according to Garmin. Music playback cuts every rating sharply; Garmin rates the Forerunner 165 at 7 hours of GPS with music.
Which GPS running watch should you buy?
The Garmin Forerunner 165 is the GPS running watch to buy, at £164.04 on Amazon UK at the time of writing (October 2026). Garmin gives it a 1.2-inch AMOLED screen, up to 19 hours of GPS-only battery and up to 11 days as a smartwatch, wrist heart rate and Pulse Ox, in a 39 g case.
Garmin Forerunner 165 specifications (Garmin)
- Display: 1.2-inch AMOLED touchscreen, optional always-on mode
- Battery: up to 11 days smartwatch, 19 hours GPS-only, 17 hours All-Systems GNSS
- GPS: GPS-only and All-Systems modes; no multi-band mode
- Sensors: wrist heart rate, Pulse Ox
- Training: Garmin Coach plans, race predictor, wrist-based running power, Morning Report
- Size and weight: 43 x 43 x 11.6 mm, 39 g
- Water rating: 5 ATM
The Forerunner 165 gives a new runner everything that matters on the wrist, with Garmin's free coaching plans in the Garmin Connect app. Its compromises are the lack of a multi-band mode for city routes and the shortest GPS rating in the table.
Garmin Forerunner 165 - pros and cons
Where to buy
Check price
Three alternatives cover multi-band GPS, long battery and a lower budget, at Amazon UK prices on 11 October 2026.
Also consider
Radar · 0-100 scores
- Forerunner 165 43mm
- Forerunner 265 46mm
- PACE 4
- Active 2 44mm
Verdict
A new runner with a phone does not need a GPS watch; a runner who wants to leave the phone behind, race or train to pace does. The Garmin Forerunner 165 at £164.04 is the one to buy, and the COROS PACE 4 at £229.00 adds dual-frequency and 41 hours of GPS. Everyday watches are ranked in Best smartwatch UK 2026, iPhone owners should read Is an Apple Watch worth it?, and band-style options are in Is a fitness tracker worth it?.
Frequently asked questions
Do I need a GPS watch for running?
Not to start running. A phone app records distance and pace well under open sky, and gps.gov puts smartphone accuracy at about 4.9 m. A GPS watch earns its place for runners who leave the phone at home, race, or train to pace targets. The Garmin Forerunner 165 costs £164.04 on Amazon UK at the time of writing (October 2026).
Is phone GPS accurate enough for running?
Yes, on open roads and parks. Gps.gov says GPS-enabled smartphones are typically accurate to within a 4.9 m (16 ft) radius under open sky, and that accuracy worsens near buildings, bridges and trees. For city-centre or wooded routes, a dual-frequency watch such as the COROS PACE 4 at £229.00 is the stronger choice.
What is dual-frequency GPS on a running watch?
Dual-frequency, which Garmin calls multi-band, means the watch listens to two satellite signals at once instead of one. Gps.gov says high-end users boost accuracy with dual-frequency receivers. It costs battery: Garmin rates the Forerunner 265 at 20 hours in GPS-only mode and 14 hours in All-Systems plus Multi-Band mode.
How long does a GPS running watch battery last?
Between 19 and 41 hours of GPS on the watches here, by maker figures. Garmin rates the Forerunner 165 at 19 hours GPS-only and the Instinct 3 AMOLED 45mm at 32 hours. COROS rates the PACE 4 at 41 hours in All-Systems mode, and Amazfit rates the Active 2 at 21 hours. Music playback cuts every figure sharply.
What is the cheapest GPS running watch worth buying?
The Amazfit Bip 6 is the cheapest GPS watch worth buying, at £79.99 on Amazon UK at the time of writing (October 2026). Amazfit rates it at up to 32 hours of continuous GPS, which works out at £2.50 per GPS hour. The Garmin Forerunner 165 costs more at £164.04 but adds Garmin Coach plans and a race predictor.
Garmin Forerunner 165 or 265: which is better for running?
The Garmin Forerunner 165 suits most runners at £164.04; the Garmin Forerunner 265 at £297.12 adds multi-band GPS and a larger 1.3-inch AMOLED screen. Garmin rates the 165 at 19 hours of GPS-only battery and the 265 at 20 hours. The 265 is worth the £133.08 extra for city routes and race-focused training.