When Fitness Tracking Must Be Accurate
For serious athletes, wearable accuracy directly impacts training decisions.
GPS Accuracy
Garmin multi-band: ±0.3% distance error, ±2.1m urban deviation. Apple dual-frequency: ±0.5% distance error, ±3.8m urban. Garmin consistently tighter tracks.
Heart Rate During Exercise
Interval running: Garmin ±3 bpm, Apple ±5 bpm with 3-5s lag. Swimming: Garmin maintained lock; Apple lost data during flip turns.
Training Analytics
Garmin: Training Effect, Load Focus, Status, Recovery Time, VO2 Max, Heat/Altitude Acclimation. Apple: simpler Training Load and VO2 Max.
Battery
Garmin: 28 hours GPS, 14 days smartwatch. Apple: 12 hours GPS, 36 hours normal.
Verdict
Garmin: Maximum GPS accuracy, comprehensive analytics, multi-day battery. Apple: True smartwatch + good fitness, Apple ecosystem.
