Garmin Forerunner 165 vs Garmin Instinct 3 Solar 50 mm
Garmin Forerunner 165 (19 h GPS, 39 g) vs Garmin Instinct 3 Solar 50 mm (60 h GPS, 60 g). Side-by-side spec comparison: battery, weight, maps, multi-band GPS and price. Which GPS watch should you buy?
GarminGarmin Forerunner 165Entry-level running watch with a 1.2" AMOLED display, 19 h GPS battery and just 39 g. Training metrics, adaptive plans and accurate multi-GNSS GPS for training and racing marathons. Garmin's gateway watch for runners who don't need maps or multi-band.
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GarminGarmin Instinct 3 Solar 50 mmUltra-rugged GPS watch with solar charging: up to 40 days in smartwatch mode (unlimited with sun), 60 h GPS and 34 h multi-band. Military-standard case, LED flashlight and dual-frequency GPS. For those who prioritise toughness and battery over onboard maps on their mountain outings.
View on AmazonSpec-by-spec comparison
| Spec | Garmin Forerunner 165 | Garmin Instinct 3 Solar 50 mm |
|---|---|---|
| GPS battery | 19 h | 60 h |
| Multi-band battery | – | 34 h |
| Smartwatch | 11 days | 40 days |
| Weight | 39 g | 60 g |
| Maps | – | – |
| Multi-band | – | ✓ |
| Music | – | – |
| Display | AMOLED | MIP |
| Price | Entry | Mid-range |
GPS battery = each manufacturer's standard GPS mode; multi-band = dual-frequency (maximum accuracy). On Suunto, Polar Grit and Amazfit T-Rex the GPS figure already corresponds to dual-band mode. Figures verified against the manufacturer.
Verdict
For maximum autonomy on long ultras, Garmin Instinct 3 Solar 50 mm lasts longer in GPS mode. If you want the lightest watch on your wrist, go for Garmin Forerunner 165. On budget, Garmin Forerunner 165 is the more affordable option.