ScubaLab tested seven new dive computers in a head-to-head evaluation. The Garmin Descent Mk3 and Mk3i were our Testers Choice for technical dive computers.

We tested the computers at the University of Southern California Hyperbaric Chamber on Catalina Island, where we put them through a series of simulated dives alongside other computers to gauge the performance of their decompression algorithm.

We also tested computers in the field at Blue Grotto Dive Resort in Central Florida. We evaluated how easy the computers were to set up, how well we could see their screens in different conditions, and how well they presented data during our dives.

Garmin continues to refine its Descent line of dive computers with the Mk3, keeping everything divers have come to love and adding a touchscreen display to complement its logical, though somewhat intimidating, five-button operation.

The bright AMOLED screen is sharper and more vibrant than ever. It earned an excellent score for ease of reading at the surface and very good at depth. The dive display has been updated slightly but retains a clean, uncluttered layout that keeps critical dive data ever-present. Alternate screens include a stopwatch, an excellent digital compass, and customizable screens. Alerts, including the beginning and ending of safety stops, are accompanied by unmissable vibrations.

The Mk3i version offers air integration in both a 43 mm and 51 mm case size and can be used with Garmin’s next-generation T2 transmitter to send and receive preset messages underwater. The larger model includes a built-in LED light.

Watchlike ergos, advanced functionality, a crisp display and a streamlined operation make the Mk3 series a great option for beginners and veterans alike, especially those who would take advantage of its myriad topside features.

Earning very good scores across the board, the Mk3 and Mk3i were a favorite of test divers and were ScubaLab’s Testers Choice for technical dive computers.