As above. There is a limit to the number of POIs you can have but when you reached your limit, it will tell you on the display. You then just deselect one for each new one you'd like to addDaveM said:Handbook page 144 has:
Navigation Menu Settings ... Map ... Show POIs - Switch on/off the display of POIs
■ Select categories for POIs - Selection of the displayed category POIs
Does that help?