TomTom PALM GPS 3229 Guide Rapide page 23

Deleting a map from the TomTom NAVIGATOR 5 expansion card
d. Select Remove maps and click the forward arrow.
e. Select the drive containing the card reader and click the forward
arrow. If only one option appears, simply click the arrow.
f. Select the map you want to remove, and click the forward arrow.
g. When the <name> map removed message appears, click the
arrow.
GPS Navigator 21