I admit to not being familiar with how a Magellan starts up..you may have to play around to determine what needs to be renamed..or wait for Fatboyfun to help..but this is what I use:
Universal-ShellSimple, customizable, all the basic tools needed, and does not mess with the WinCE registry (which is what
can make Miopocket a bit dangerous on some devices).
PS...new link to Universal Shell in case others are dead: