# Garmin Descent Mk3i vs Oceanic Geo 4.0: specs and price compared

A sourced, side-by-side comparison of the Garmin Descent Mk3i (Garmin) and Oceanic Geo 4.0 (Oceanic) among dive computers. Oceanic Geo 4.0 is the cheaper of the two at $439.95.

## Side by side

| 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 | — |

## Key differences

- 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

**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.)

## Sources

- Garmin Descent Mk3i: https://www.garmin.com/en-US/newsroom/press-release/outdoor/garmins-new-descent-mk3-series-dive-computers-have-200-meter-dive-ratings-bright-amoled-displays-and-options-with-a-built-in-flashlight/ (garmin.com, verified 2026-07-11)
- Oceanic Geo 4.0: http://web.archive.org/web/20201112041439/https://www.oceanicworldwide.com/product/computers/geo-4-0/ (web.archive.org, verified 2026-07-11)

Canonical: https://frontdeskreview.com/gear/dive-computers/garmin-descent-mk3i-vs-oceanic-geo-4/
Cite: Per The Front Desk Review, Garmin Descent Mk3i ($1599.99) vs Oceanic Geo 4.0 ($439.95) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/dive-computers/garmin-descent-mk3i-vs-oceanic-geo-4/
License: CC BY 4.0.