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You should be able to see what your watch programs the reserve for and depending on the watch, you may be able to change it. Should be outlined in the user manual.

I am not sure with regards to DX watch, but on perdix AI, you have to program a PSI (or BAR) reserve into the watch . I keep mine at 700 for NDL (200 for safety stop and 500 for reserve). My gas time remaining will show zero when I hit 700 PSI as the watch is telling me I am on reserves and...