POI icons on Columbus satnav

Are the size of the POI icons shown on the Columbus satnav a set size?

I have added my own POI category for the speed camera database i use from pocketgps and was wondering if I made the icons for them slightly larger before creating my POI file would they be shown slightly larger on screen?

Just wanting to make them stand out a little more than they do at present.

Cheers

Dave.