Agree entirely: dump them: They hark back to the days of slide rules and logarithm tables I used to struggle though O level maths (that's how old I am.)
I haven't used mine for 8 years: that's not to say I don't work out the wind drift factor every time I fly significant distances, I do ( though I know a few peeps who fly Arrers who don't bother) but I use the asa flight calculator, and yes I keep a spare set of batteries in my flight bag.
These days when most GPS have a calculator function too I really can't see the need for the CRP.
Ducks head below parapet.
Safe flying
Cusco
