In short, you need to compare the images in your navigator with the files in the content/speedcam/ folder.
The pongo skin contains VB encoding by default, to use other encodings you need to change the UX speedcam - speedcam_mod.zip. I don't know what you changed to give an accurate assessment of file compatibility.
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SP encoding is based on an earlier version of the BBS database, but it has been modified based on the new encodings of the laradiobbs forum. Currently, the BBS speedcam.txt files are intended for laradiobbs forum skins.
SP coding for the gpspower forum and adapted speedcam.txt - Mod AF for these codes correspond to the correct notification on the navigator screen.
PS
Unfortunately I was unable to complete my efforts to change the code or create another code for the pongo skin so that any user could download the files intended for the pongo skin. Perhaps the problem is that the BBS does not have the technical ability to create the correct code for the end of the middle speed section, namely the content of speedcam.txt with a speed of 5 km/h