I've mailed him about the E-6B flight computer missing in his database and collection. The E-6B is still in production and widely used, not only for pilot train

I've mailed him about the E-6B flight computer missing in his database and collection. The E-6B is still in production and widely used, not only for pilot training. I'm using it for sailing, and have not yet found any other intuitive modern calculator for drift/vector calculations(1). Smartphones have big problems with sunlight, and with wet fingers. Not to talk about the problem that most smartphones dislike water. (1) Lets say your boat runs 7 knots, you have a current of 2 knots from 123⁰. What course do you talk to reach a target 321⁰. Those type of calculations are trivial on the backside of an E-6B. And the frontside contains all those practical conversations between imperial, nautical and metric systems, e.g. whats the weight of 10 gallons of fuel in metric tons would be a question that is trivial to answer on the frontside.