Just a matter of finding the right replacement. The formatting is
"strange" on the GX-50 (don't expect your friendly neighborhood Windows
machine to recognize it) but the Jepp writer should format it okay.
FWIW, I've gotten several different brands of cards from Garmin (for my
GX-60). If you do dig up the exact spec for the thing, please let us
know.

Now if Garmin would just let us have a download subscription that
didn't have to be used in precisely 13 months. {:(