Embraer EMB145 Operation Manual page 2509

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If the event was caused by the GPS sensor (satellite signal, GPS'
antenna or receptor), the pilot should monitor HIL (Horizontal Integrity
Limit in NM) on GPS STATUS Page (1/4) and when it meets phase of
flight accuracy, reselect GPS. The GPS integrity monitor is defined for
three phases of flight, each with a specified Alarm Limit and Time to
Alarm, as showed in the table below:
Phase of Flight
Enroute
Terminal
Approach
Otherwise, if the GPS was deselected due to a poor DME environment
and the pilot has verified that the HIL value is within the limit for the
respective phase of flight, it will be necessary to first manually deselect
the DME through DME STATUS Page (1/1) and then reselect the GPS
on GPS STATUS Page (1/4).
REVISION 35
AIRPLANE
OPERATIONS
MANUAL
Alarm Limit
2.0 NM
1.0 NM
0.3 NM
NAVIGATION AND
COMMUNICATION
Time to Alarm
27 seconds
7 seconds
7 seconds
Page
4A
2-18-35
Code
02