Hey criss,
You don't need laptop, you can print the maps out and take them with you..try and keep the horizon in the frame when printing and take note that the sky will rotate thrioughout the night...if you do get a laptop i have a progrmme for making the screen red if you want it...actually, i should leave the link for that one too...ITS FREE...justa little proggy, configable to suit your needs...works quite well...
here's the link..
cheers
http://www.adpartnership.net/darkadapted/