I realize we can not use Doppler tomorrow and have limited experience with it, we will be using an Arrow antenna, HT and a sniffer... Maybe a Digital Scout if needed...
Anyways, several have emailed on APRS-DF, here are some links:
The original document: http://www.aprs.net/vm/DOS/DF.HTM
Here is an update: http://www.aprs.org/dfing.html
The best info: http://homepage.ntlworld.com/rossjwilkinson/g6gvi/rdf.html
There is a lot of info on APRS+DF on Google. I have the itch now, so we will have fun tomorrow night trying for the first time, but my love of APRS will make me figure out how this works and/or doesn't compared to using my ears....