A simple coordinate display can be enabled with the Game Genie codes XAKKEZXY UGKKOXXK. Note that all other status bar updates will be disabled until you change screens, due to a lack of Vblank time.

The first set of values is for the boy, and the second set is for the Blob. Each value represents the character's current screen number, X position, and Y position, respectively.

(I think there would be at least a few people who could get some use/fun out of this!)