Yes — almost all operators require a personal dive computer for repetitive multi-day diving. Rental units are available, but owning one you understand is far safer.
A personal dive computer is effectively mandatory on liveaboards
You will be doing 18 to 28 dives in a week, often four a day, and tracking residual nitrogen across that many repetitive profiles by table is neither practical nor safe. Most operators state the requirement in their terms and will rent you one if you show up without.
What matters in a computer for liveaboard diving: a nitrox-capable algorithm, a clear display readable in low light, a user-replaceable or easily charged battery, an audible or vibrating ascent-rate alarm, and a logbook you can download. Air integration is a nice extra rather than a necessity.
Serious divers bring a backup
If your primary floods or the battery dies mid-trip, a backup keeps you diving instead of sitting out 24 hours. An older computer, or even a basic bottom timer plus your logged profiles, works.
Dive conservatively across the week
Multi-day repetitive diving loads tissue compartments in a way single-day diving does not, so extend safety stops, add a deep stop when appropriate, hydrate seriously, and treat the last day before flying with respect — most operators enforce an 18 to 24 hour surface interval before flights.
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