Cobra, about the labeling...
I think using symbols to describe what things are would be best but it is a challenge to come up with intuitive symbols.
I have some old AH1 maps, downloaded from netaces, that I printed out and used before I got used to the base layouts.
These maps used the most basic shapes to identify things, and It worked great. I had to look twice at first, "what did that triangle mean, again?". But once you know the meaning of the symbols, our eyes and brain catch up a lot quicker.
If looking for fuel; you will be able to find the fueldrum symbols much faster than any letter combination.
To sum it up, our visual sensory system find symbols more intuitive than letter combinations. When searching for specific items on a map, we will find the symbols faster than letter combinations. We are also more prone to overlooking things when using letter combinations.
Examples:
FH: a small single engine plane
BH: a simple B17 symbol
VH: a tank
Fuel: a drop (like a child would draw a raindrop)
and so forth...