Garmin GPSMAP 580 Owner's Manual page 36

Operation Mode
Proximity Points
Use the Proximity sub tab to define an alarm circle around a stored
waypoint location. The alarm circle can help you avoid reefs,
rocks, or restricted waters. Up to 100 waypoints can be listed with
a maximum alarm radius of 99.99 nautical miles, statute miles, or
kilometers.
If a proximity alarm circle overlaps an existing alarm circle, a
"Proximity Overlaps Another Proximity Waypoint" message
appears. Because the unit only alerts for one of the overlap points,
use caution when navigating in these areas. You are only alerted
to the closest proximity waypoint when you enter an alarm circle
overlap.
To turn proximity alarms on or off:
1. On the Main menu, highlight the Points tab, and then
highlight the Proximity sub tab.
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2. Highlight the field below Proximity Alarm, and press Enter.
3. Select the On or Off setting, and press Enter.
To add a proximity waypoint:
1. On the Proximity sub tab, use the Rocker to highlight an
empty line on the Proximity List, and press Enter.
2. Select a waypoint or point of interest from the Find Page.
3. Highlight OK, and press Enter.
4. Press Enter to define the proximity radius.
5. Use the Rocker to enter a distance value (up to 99.99 units),
and press Enter.
To clear one or all proximity waypoints from the list:
1. On the Main menu, highlight the Points tab, and then
highlight the Proximity sub tab.
2. Highlight the proximity waypoint you want to clear, and press
Menu.
Proximity Points Tab Options menu
GPSMAP 580/585 Owner's Manual