If you have updated your POI and icon from this site the only option is to turn on the sound as the display of warning is set in the POI control as visual and sound or either deviation from this cannot be applied - note the new S range i.e. s150 does display the warning visually at the bottom of the screen - beware there seems to be a fault in navman units where POI's are uploaded where the unit resets as it seems the cache overflows