Magellan 800 - Manual (Page 82)

Chapter 14: Navigation Options
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Use the numeric keypad to enter the number of degrees in which to set the alert. When you
have finished, select
OK .
The First Warning is set to alert you when you are within a certain number of feet from the POI.
Select First Warning .
Use the numeric keypad to enter the number of feet in which to alert you. When you have
finished, select
OK .