Thank you very much. I recall seeing some of those threads, but somehow missed them when trying to search for them yesterday.
Those of you who use a wheel like that: what are your experiences regarding accuracy and ease of use? My intuition would be that a wheel is easier to use than plotting solutions on map, atleast once you get the hang of it. As for accuracy, when plotting on map it easy to refine the solution when you get more observations. How do you do this with the wheel (which, if I understand it correctly, gives the solution based on two observations only)?
Ah, well, I guess I'll just have to build one and try it out myself.