Cheapest vs Most Expensive Garmin: GPS Accuracy Tested
Multi-band GPS on a Fenix vs single-band on a Vivoactive — the results are closer than you'd think, and the battery cost of multi-band is real.
Day 21: GPS Accuracy Showdown
I ran the same route wearing both a Vivoactive (single-band GPS) and a Fenix (multi-band GPS) simultaneously. Here's what I found.
The technology difference
Single-band GPS (Vivoactive, Forerunner 55): Uses one frequency from multiple satellite systems (GPS, GLONASS, Galileo). Works well in open areas.
Multi-band GPS (Fenix, Epix): Uses multiple frequencies simultaneously. Much better accuracy under tree canopy, near buildings, in urban canyons.
Test results
- Open road: Both tracks almost identical. Difference <0.5%
- Under trees: Fenix noticeably cleaner track. Vivoactive had some drift
- Total distance recorded: Identical on both watches
- Battery used: Vivoactive 3%, Fenix 4% — multi-band costs more power
Verdict
For road running and flat terrain: single-band is fine and you'll get more battery. For trail running, forests, or dense urban areas: multi-band is meaningfully better. The Fenix costs significantly more — but the GPS difference is real.
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