Radio Mobile holds a default set of icons. The first 89 icons are internal to the program.
The internal icons have a preset arrangement so they are also used in APRS.

Internal icons in Radio Mobile.

In addition to the internal icons aditional icons can be stored in the icon folder. Internal Icons are numbered to 89. Icons numbers in the icon-folder start at 90.

Radio Mobile accepts icons that are exactly 16x16 or 32x32 pixels (preferred size) but also other sizes.