Garmin
Garmin Descent Mk3i
$1599.99
Released 2023-11
Best Dive Computers · head-to-head
Garmin Descent Mk3i vs Oceanic Geo 4.0
A sourced, side-by-side comparison. Oceanic Geo 4.0 is cheaper at $439.95. Every spec and price links to its source.
Oceanic
Oceanic Geo 4.0
$439.95Cheaper
Which is better: the Garmin Descent Mk3i or Oceanic Geo 4.0?
On the specs we track, they're closely matched. The Oceanic Geo 4.0 is the cheaper at $439.95.
As an Amazon Associate we earn from qualifying purchases. Prices verified at capture; live price may differ.
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Garmin Descent Mk3i | Oceanic Geo 4.0 |
|---|---|---|
| US price | $1599.99 | $439.95 |
| Brand | Garmin | Oceanic |
| Released | 2023-11 | — |
| Algorithm | Bühlmann ZHL-16C | Dual Algorithm (PZ+ and DSAT) |
| Max depth rating (m) | 200 | 100 |
| Display type | amoled | segment-lcd |
| Display size (in) | 1.4 | — |
| Air integration | Yes | — |
| Gas mixes | — | 2 |
| Dive modes | — | 4 |
| Digital compass | Yes | — |
| Battery type | rechargeable | user-replaceable |
| Battery life dive hrs | 66 | 300 |
| Bluetooth | Yes | Yes |
| Weight grams | 77.8 | — |
Sources — Garmin Descent Mk3i: garmin.com (verified 2026-07-11). Oceanic Geo 4.0: web.archive.org (verified 2026-07-11).
What's the difference between the Garmin Descent Mk3i and Oceanic Geo 4.0?
Where the two actually differ on the specs we track (5 of 12). Matching specs are omitted.
- Algorithm: Garmin Descent Mk3i Bühlmann ZHL-16C vs Oceanic Geo 4.0 Dual Algorithm (PZ+ and DSAT)
- Max depth rating (m): Garmin Descent Mk3i 200 vs Oceanic Geo 4.0 100
- Display type: Garmin Descent Mk3i amoled vs Oceanic Geo 4.0 segment-lcd
- Battery type: Garmin Descent Mk3i rechargeable vs Oceanic Geo 4.0 user-replaceable
- Battery life dive hrs: Garmin Descent Mk3i 66 vs Oceanic Geo 4.0 300
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Garmin Descent Mk3i
Only one whitelisted hands-on tester (TechRadar) reviewed the exact Garmin Descent Mk3i, scoring it 5/5 overall. It praised battery life, comprehensive dive features and durability, but flagged the high four-figure price (plus paid T2 transmitter) and a relatively clunky UI. All three quotes were verified as literal substrings of the fetched article. (1 sourced review.)
Praised: Impressive battery life even with all sensors active; Comprehensive dive features: SubWave diver-to-diver comms, multi-gas/trimix, 200m rating; Rugged, durable titanium case with scratch-resistant sapphire display.
Flagged: More expensive than rivals; four-figure price (plus paid T2 transmitter); Relatively clunky UI versus native Apple/Google watches; Five physical buttons have a learning curve.
Oceanic Geo 4.0
No sourced tester review yet.