You don't need GPS for finding folks at Dayton Unless you are lost and cannot read a map.
I have prepared 3 maps of the Dayton Buildings and Flea Market area that have LAT/LONG coordinates on them. Just manually enter your coordinates for your space or booth or present location into your D7 and then your radio will tell you which direction and how far anyone else is...
Indoors, the maps work fine (GPS doesn't). Even at 60 foot resolution, there are 75 discrete locations inside. In the flea market, there ar 650 sets of coordinates to help you find anyone. It also helps if you key in your space or booth number into your text for the final few feet...
To find someone, enter your manual position into your D7, then your radio will tell you which direction and how far away they are! Or look at their coordinates on the these gridded maps:
http://www.ew.usna.edu/~bruninga/aprs/Dayton-inside-map.GIF http://www.ew.usna.edu/~bruninga/aprs/Dayton-flea-east.GIF http://www.ew.usna.edu/~bruninga/aprs/Dayton-flea-west.GIF
Bob, WB4APR