I happen to have a Casio dive watch (with dive log capabilities) from before DIR so I use that as backup to my Aladin Tec.
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H2Andy:that's the exact watch i have as a back up, except i removed the straps and use a bungee loop
i love it
Vie:I think something like a Suunto D3 or D6 would make a really nice backup timer to the BT. D6 would be a little overkill (and pricey) for the job though.
serrada:How did you bungee loop it? Is there enough room between the pins and the watch casing to put the bungee? What size, 3/16"? I like the idea.