Lowrance electronic Mapping GPS and Multimedia Player - Manual (Page 37)

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Current Position Lock
Two buttons on the left side of the Satellites screen indicate the quality
of the units position lock. If 2D or 3D is not highlighted the unit may
not have a satellite lock.
2D
lock does not include altitude. The unit must receive reliable signals
from 3 satellites to establish a 2D lock.
3D
means the unit has achieved a more reliable lock, including altitude.
The unit must receive signals from 4 satellites to establish a 3D lock.
EPE (Estimated Position Error)
The Estimated Position Error, or EPE, represents the expected error
from a benchmark location. If the EPE shows 50 feet, then the position
shown by the unit is estimated to be within 50 feet of your actual loca-
tion.
Satellite Display
A white circle serves as a graphical view of the satellites overhead.
Each satellite is shown on the circular chart relative to your position.
The GPS receiver is tracking satellites that are in light blue type. The
receiver has not locked onto a satellite if the number is in dark blue.
Lat/Lon Coordinates
Beneath the Satellite Display are the coordinates in latitude and longi-
tude.