These ebuilds come from http://gentoo.zugaina.org/.
If you have some problems, go to the official site first.
gpsman : A graphical GPS data manager that supports several devices. ( http://www.ncc.up.pt/gpsman/wGPSMan.html )
merkaartor : A Qt4 based map editor for the openstreetmap.org project ( http://www.merkaartor.org )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a zugaina
For Paludis use this rsync : rsync://gentoo.zugaina.org/zugaina-portage
If you have a problem : ycarus(-at-)zugaina.org