David: No, you do not have to buy an official bottom timer. In some cases this may not be practical. For example, the TCDP runs the Vyper in gauge mode. Some of the old boys have bottom timers that go deep, but the new ones do not. Uwatec's currently go to 330' and the Vypers go to 490'. Regards, Tod ------------------------------------ Global Underwater Explorers, Tech 1 SCRET, Support Diver ------------------------------------ -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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