1.- In mapsource you create waypoints where you want to have your POI´S, and then you save them as .GPX files.

2.-you have to plug in your GPS to the PC and run POI loader

3.-It must recce your device, then you click on next, then choose manual, and then click on browse, you search your .GPX files.

4.-In the next screen you choose warning type (distance or speed) and gives it value.

5.-click on next and your POI´s will be installed in the folder GARMIN/POI´s of your SD card

You will be aware that you are not allow to modify them, if you want modify your POI´s you have to restart the process again and do it in the mapsource.