How To Erase Uploaded Maps On Mapsend? in GPS technology and devices Posted April 19, 2004 Well, if you just don't want to see it, take the SD card out of your Meridian and put it away (detail maps reside on the card only). If however, you want a different detail map, just upload it and it will replace the previous one. If you use a card reader, you can have multiple detail maps on the SD card, and use Card Utilities on you Meridian menu to switch between them. Just rename the detail map from the default to something descriptive.