How do I Change a Certain Icon Used Numerously to a Different One?
Perhaps, in the course of assigning keys, you switched icons on a key from the original icon to one whose picture you liked better. For example, you might have changed the SUN icon 
to the SUNSHINE icon 
. Later you decide that you would like the SUNSHINE icon to appear wherever the SUN icon is assigned but you don't want to go to the trouble of reassigning the icon to all the instances where SUN might occur. Happily, your device will do this for you automatically.
To Change All Occurrences of an Icon:
1. Open the CHOOSE OVERLAY menu in the Toolbox.
2. Select the Change all Occurrences of an Icon option.
3. Select the icon you want to change.
4. Select the icon to change to.
5. Select YES you want to change icons, or NO (you changed your mind).
6. Your device tells you how many occurrences of that icon were changed. Select OK.