Duty Time calculator

[mondriver]

I am thinking of getting a PDA...probably a HP4150.

I would ideally like to have a little app which could calculate crew duty time maximums......

Does anyone know of such a piece of software..?

Also, I'd like to use a crew allowance calculator...ie: enter start time and end time of duty, and it will calculate allowances earned based on the allowance rate...etc


Any ideas?

Thanks