Ranging and Range Finders

Hi, I have another few noob questions:

1) How do you accurately plot range on the Nav map. The tools are so poor you can only guess at the increments between 1k and the next. E.g you want 1560k finding the 1k is not a problem and currently i would just go plot in between 1k & 2k to get the additional .560k but this is not very accurate!

how do you accurately plot the additional .560k ? Are there any additional tools or mods I can use to get smaller divisions on my nav tools (Mainly Compass/ Ruler) or something ?

2) I currently have a range / bearing tool which appears when zoomed in:

a) Can you somehow toggle this on / off? As when I am zoomed in and plotting it hides my markes and makes things diffcult to read etc

b) Are the ranges on this "zoomed bearing/range finder" any good as they seem to differ greatly to when using standard tools. ie. if I place a ruler in the center and drag it out the 1k mark of the ruler appear way before I reach the 1k marking on the zoomed range finder.

I am doing marvelous on the manual firing but want further accurancy so i can pick the sweet spots of ships and not just hit em roughly!

Which brings me to my final question, are there any reconginaition maunual mods showing sweet spots?

Cheers guys