Digital Colour Charts

[AndyG]

OK, I accept this has probably been asked before, in my defence I did search for it!!

I'm tired of trying to guesstimate colours for my repaints; does anybody know of a RELIABLE colour chart (or cross reference) which will enable me to convert colours for use in Paint Shop Pro.  Anything that will allow me to enter RGB or CMYK codes will be brilliant - mainly needed for RAF/RN and RLM colours, as I have managed to find an FS chart, but any others will be welcome.

Big thanks, in anticipation    ;D