A-Z letters only work for maps with 26 addresses or less. Numbers inside the marker work for maps with 99 addresses or less. Numbers only work when the circle or square marker is selected.
To get numbers or letters in your marker:
- Click the "Validate and Set Options" button, then click "Show Advanced Options".
- In the second column, select "label markers" and choose "numbers or letters" from the drop down menu.
- Click "Make Map or Update Map" and then Save. Your letters and markers will appear in your saved map but not on the Edit Map.