I have deleted the folders associated with the native "Maps" application, as well as "Mobile Safari" in order to permanently remove their icons from the springboard (I used iFile for this).
Problem is I didn't back them up, and want them back, so if anyone can pm me that would be good!
they are in: ROOT/var/stash/Applications.Mkm0qm
There are some apps like the iphone's email client that want to open Safari to navigate to web links,
and another public toilet finding app wants to open the native map application to show directions to the nearest public toilet.
Lesson learned... I'd rather not have to upgrade my fw, and don't have a copy of the now outdated 4.2.1 firmware. I'm willing to try files from a later fw ver and see if it works.