I have been reading through all the posts to understand how the 1600b uses the profiles in correcting distance. As I understand it, it applies one of the curves and simultaneously adjusts for temp and pressure over sea level, as well as angle. My problem is I don't think any of the profiles will fit my load. I have not been able to find the entire chart, but I did get the information on curve 4 out to 500, and it was well off. From the parts I have for curve 5, I suspect it will be off in the other direction...ie I will fill in between. All I really want is for it to give me a corrected distance based on the angle, and to leave the rest alone, which it does not seem to do. Am I understanding this correctly? That is, in order to get the angle corrected distance with any decent accuracy, I have to have a load that matches one of the curve presets? Somehow, I find it hard to believe that as many people recommend this RF, all of them fit one of the curves, so I wonder if I am misunderstanding how all of this works. Thanks!