Garmin GPSMAP 2006 Owner's Manual & Reference page 49

Reference
Proximity Waypoints
Proximity Waypoint List
Proximity Waypoint
Proximity Circle
A circle (red) will appear showing the alert boundary for the
proximity waypoints.
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To turn proximity alarms on or off:
1. Use the ARROW KEYPAD to highlight the field below "Proximity Alarm" and press ENTER/MARK.
2. Select the desired 'ON' or 'OFF' setting and press ENTER/MARK.
The following SOFT KEY options are available from the 'Proximity' submenu of the 'Points' tab:
• Clear Alarm— removes selected waypoint from proximity list.
• Clear All— removes all waypoints from proximity list.
To clear one or all proximity waypoint(s) from the list:
1. Use the ARROW KEYPAD to highlight the proximity waypoint to clear.
2. To clear a single alarm, press the 'Clear Alarm' SOFT KEY.
3. To clear all proximity waypoints, press the 'Clear All' SOFT KEY.
4. Use the ARROW KEYPAD to highlight the 'OK' prompt and press ENTER/MARK to confirm.