I'm using a Trimble GeoExplorer 3000, and currently don't have access to Pathfinder, so cannot process the data. Is there anyway to extract lat/long coordinates from the device itself? Alternatively, is it possible to convert a large number of Easting/Northing coordinates to lat/long?
make an event layer, (File, Add data, Add XY data),
save it as a featureclass or shapefile
define it coordinate system (aka the projected one in the easting/northing)
use the Project tool to get a new layer out to a geographic coordinate system (aka in decimal degrees)
Have you looked here?
http://trl.trimble.com/docushare/dsweb/Get/Document-528617/GeoExpl3000_UserGde_RevB_ENG.pdf