Use the skill and click on a blank map. A window will appear which will allow you to set your map’s scale. The higher your skill, the greater the maximum scale. If successful, the blank map will be inscribed with a map of the appropriate scale.All maps will be centered on your position at the time they’re made.

Gideon's Advice
20-52 Local Maps
52-65 City Maps
65-67 Sea Charts
67-99.5 World Maps
99.5-100 Level 2-4 Tattered Treasure Maps