I'm having some trouble on Illustrator CS4.
I'm creating a metro map and am having trouble with items taking too much of a jump when I nudge them with the arrow keys. I've been through other threads and couldn't find a specific answer to my problem. I've deselected all the obvious grid options etc.
As you can see from the screen shots I'm zoomed pretty close in, and when I am trying to position the black dot (the first of many stations) precisely in between the edges of the brown line, one press of the arrow key is taking it too far to the left or right.
I'm also having this problem when trying to position the lines (for example where the green, brown and yellow lines run parallel) next to each other. I want them to sit completely flush with one another, with one not obscuring another, but when I am nudging them back and forth there will either be some overlap or a white gap in between.
Links to screen shots can be found below: