theduckguru
Contributor
The signature in the log book is evidence that the diver tested the gas and is aware of the % of oxygen in the mix. Sounds like a simple safety procedure to me.
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I think the idea of a nitrox fill log to protect the LDS from liability is counter productive. The industry preaches 'always analyse your own gas' and personal responsibility to match your mix to your dive.
The moment you introduce an element of checking and supervision on the part of the LDS, you blur the line.
My LDS uses a log all the time for nitrox. Trimix requires no log. Also certain regulars/staff don't seem to be required to log their mixes.
mix, mod, tank serial number and then you have to sign off