My E6B (Aluminium equivalent of CRP) has never been quite the same since my instructor man-handled a C-152 over it. Important lesson: never leave your flight bag unattended next to an aircraft. Luckily my headset was in the cockpit.
Anyway, it still works even with a crease up the middle. I use it mainly for conversions (gallons of fuel to pounds weight etc). I use a fairly ancient ('82 vintage) programmable calculator to do my wind calcs for the flight plan. I type in the wind and then each leg and it spits out the course to fly and ground speed. At the end it shows total distance and an estimate of fuel burn (always double checked, if marginal!).
The only problem is that every time the battery runs out (every 18 months or so) it forgets the program, so I have to type it all in again. Then I have to remember how to use the E6B so that I can cross-check a few wind / track combniations to check it still works. All good revision, I suppose.
If anyone would like a copy of the BASIC program that does all this, then feel free to PM me!
TG.