http://www.mapquest.co.uk/cgi-bin/ia_find?link=btwn/twn-map_latlong_degrees_form
My station is now about 30 feet from the nearest intersection of latlong seconds thanks to some tweaking with Mapquest.
I did the same thing myself -
borrowed a friends GPS, then went to that site and tweaked - I’m right on now!
Two more ways to have fun finding your lat/long:
www.goecode.com Use “Test drive Eagle Geocoding from an interactive web page”
www.terraserver.com Use search to find your general location, move the cursor on the satellite image and the exact lat/long are displayed.