Yes, that is correct. I am currently working on a how-to for installing POI's and POI Alerts.Ok, I think I have it figured out...
The POI is the .ov2 file (and the corresponding .bmp file) and an ALERT is a .ogg file, right?
I was thinking that you needed the .ov2 file AND the .ogg file in the Maps folder for a POI to show up. I guess you only need the .ogg file if you want an ALERT for that particular POI.