There are several methods, such as including the information in the title of the POI or in the entry itself(see FAQ's).
The simplest method to add a proximity alert to an entire POI file (i.e. same distance for all entries) is to use POI Loader 2.4.1 (beta) in manual mode. As you load each POI file, you have the option to set a proximity alert or speed alert.
Proximity alerts
How does one add a proximity alert?
There are several methods, such as including the information in the title of the POI or in the entry itself(see FAQ's).
The simplest method to add a proximity alert to an entire POI file (i.e. same distance for all entries) is to use POI Loader 2.4.1 (beta) in manual mode. As you load each POI file, you have the option to set a proximity alert or speed alert.
Garmin StreetPilot c530, Mapsource