Amazfit T-Rex 3 vs Garmin Instinct 3: rugged GPS watches compared for NZ
Garmin's advantage is software, and it is not a small one — Garmin Connect's training load, recovery and race-prediction tools are the best in the business, and the platform has a decade of trust behind it. What Amazfit does is deliver the hardware you want at a much lower price: a bright AMOLED, dual-band GPS, free offline topographic maps with turn-by-turn, and a battery that stretches to around four weeks. For a tramper or a hunter who wants maps and battery, the T-Rex 3 delivers more watch per dollar. For a serious runner or triathlete who lives in training metrics, Garmin remains worth the extra.
Spec by spec
| Spec | Amazfit T-Rex 3 | Garmin Instinct 3 |
|---|---|---|
| Display | 1.5in AMOLED✓ | AMOLED or MIP (variant) |
| Battery | Up to 27 days typical✓ | Up to 24 days (MIP solar longer) |
| GPS | Dual-band circularly polarised | Multi-band GNSS |
| Water rating | 10 ATM + MIL-STD-810 | 10 ATM |
| Maps | Offline topo + turn-by-turn✓ | — |
| Health | HR, SpO2, sleep, temperature | HR, SpO2, sleep, Body Battery✓ |
| Compatibility | iOS + Android | iOS + Android |
A tick marks the stronger spec on that row — not necessarily the one that matters to you.
Which one should you buy?
Buy the Amazfit T-Rex 3 if…
You want offline maps, huge battery and an AMOLED screen without paying flagship money.
Prices & specsBuy the Garmin Instinct 3 if…
You train seriously and want the deepest analytics and the most mature ecosystem.
Prices & specsCommon questions
Do the T-Rex 3 offline maps cost anything?
No. Offline topographic maps and turn-by-turn navigation are included, with no subscription. That is a notable difference from some rivals where mapping is a paid tier or a higher model.
Is 27 days of battery realistic?
That is the typical-use figure. With the always-on display and continuous GPS tracking it drops substantially — but it still comfortably outlasts most AMOLED smartwatches on the market.