finally a solution
patched maemo mapper 2.6.2
works fine on Nokia 770, 2007He
no more grayed out input fields in MM Settings

abbreviated web link to deb file
http://tinyurl.com/maemo262

from
http://talk.maemo.org/showthread.php?t=34318
"
===
TA-t3

I have no idea if this will really work for OS2007HE and the 770, but you could try my patched version of maemo mapper 2.6.2 which you can find in this post:
http://talk.maemo.org/showpost.php?p=319596&postcount=1

I patched the original 2.6.2 and rebuilt for OS2007, because the original would not let me select a bluetooth GPS (or search for one).
__________________
N800/OS2007
-- Metalayer-crawler delenda est.
====
"