Garmin 155XL Maintenance Manual page 43

Allow the unit to lock onto satellites. If the unit has current almanac data, it will list the visible satellites on the
row labeled SAT and will begin acquiring satellites in a period of a few minutes. If the unit indicates SEARCH
SKY instead of ACQUIRING, it must search the sky for available satellites and collect almanac data. A 'search
the sky' operation may take twenty to thirty minutes to complete. The unit must enter 3D navigation mode.
The unit must display the following:
1. Satellites with signal strength 3 or greater.
2. The average signal strength on satellites above 20 elevation shall be greater than or equal to 3.5 (see
pilot's guide for instructions). Satellites that are acquiring should not be included in the average
signal strength calculation.
5-12 190-00067-25 Rev D