What if the background of a custom map is black (i.e., not transparent)?

Sometimes custom maps load with the background black (not transparent) due to the range of values used in the custom map data. To display the map with the background transparent:

• In the Layer Manager, delete the custom map.
• Reload the custom map as before, but in the upload box type "0" (zero) in the ignore field.
• Continue opening the map as normal.

Your custom map will now have the background set to transparent.