Here's something that I think some people would have missed, and it's been there since first release
For the APRS Icon, shown next to the Row Column text boxes, if you click on that image it will bring up a dialog box with APRS icons that you can click to choose.
Also whenever you type a valid set into the two text boxes it will automatically show the correct icon.. e.g / and > is the little red car icon
APRS Icon Picker
APRS Icon Picker
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-73 de MM7DBT