The "dive" part is a red herring these days, as the use of watches to manage decompression strategies has declined since the 90s, and by early 2000s dive computers became the default tool. Use of a dive-watch for diving is almost non-existent these days.
Some example dive computers, for those interested:
It's simply a description of the style of the watch. Just as most people wearing a bomber jacket aren't flying B-52s, and most trench coat wearers aren't fighting in trenches, most dive watch wearers aren't diving. They are still useful terms, despite their relative professions moving on to newer tech.
Some example dive computers, for those interested:
- Suunto Zoop [1] - Shearwater Perdix [2] - Garmin Descent [3]
[1] https://www.suunto.com/en-gb/Products/dive-computers-and-ins...
[2] https://shearwater.com/products/perdix-2
[3] https://www.garmin.com/en-GB/p/632320