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July 2006 Vol. 32, No. 7   RSS Feed for Undercurrent Issues
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Serious Software Error in Suunto Computers

from the July, 2006 issue of Undercurrent   Subscribe Now

Certain models of Suuntoís D6 and D9 wrist computers have a significant software bug that may cause them to track time incorrectly. The error may occur when the computers automatically recalibrate to the correct time, or when the user updates the seconds in set mode. Suunto estimates these models will malfunction 0.6 percent of the time (one out of 167 dives). When the error occurs, every fourth second is not registered during a dive and surface interval. The computer shorts both the dive and the surface interval by 25 percent. An hour dive would show as 45 minutes, an hour surface interval as 45 minutes. The error could seriously affect decompression requirements.

The products affected are: D9, serial numbers 62102582 and below, and D6, serial numbers 62103693 and below. The serial numbers are on the back of both devices.

A Suunto spokesman said says there have been no injuries, but a diver should immediately return the unit to his dealer who will send it to Suunto. There is no charge and turnaround time should be less than two weeks. Suunto will also replace the battery and perform a pressure test free of charge. At, Suunto promises that the computerís logbook memory will remain intact after updating; however, download all data onto a computer as a back up before returning it. If you donít have a dealer nearby e-mail the Suunto Help Desk at Or call 1 800 543 9124 in the USA and Canada. A computer with the correct software will bear a small white dot on the rear.

A Suunto spokesperson told Undercurrent that the company is providing the free update for computers purchased through gray marketers such as Leisure Pro.

The U.S. Consumer Products Safety Commission has been informed.

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