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May I suggest getting an inexpensive bottom time/depth gauge like the Uwatec and the spending the balance on a GUE DIR fundamentals class?
Uncle Pug:Continuing education would be the best option. Your brain is much more sophisticated and with a modest amount of correct instruction it is much more capable than the most expensive dive computer.
May I suggest getting an inexpensive bottom time/depth gauge like the Uwatec and the spending the balance on a GUE DIR fundamentals class?