As an experienced traveler and very experienced guide for divers a computer is a great inexpensive safety item- an inexpensive computer (less than $300) acts a dive timer- no need to remember to start or stop your watch, an accurate measurement of deepest depth and helps to avoid the human error factor in using tables- a small price to pay for a lot of safety. Also on most vacation dives with a few 60+ ft dives in a day diving tables quickly becomes an issue if you are doing longer multilevel dives- an average dive for me is 45 minutes to an hour depending on how good my clients are on air or if its just me and a buddy diving may be even longer, most dives we dip to over 60ft and sometimes as deep as 80 or 90 for short time- by the end of the first dive I would be off the tables but with a dive computer I can safely conduct these dives over many days. I normally suggest to my students that an inexpensive computer would be a very wise investment very early in their career.