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The LARGE knob “scrolls” or pages forward or backward
through the screens in the order shown in Section 2. After
you become more familiar with each screen, you may
develop a preference for some. This sectiondescribes each
screen.
GPS
Signal
Strength
Screen
This screen, the first to appear after the unit starts up,
contains information about signals received from visible
satellites in the sky.
The screen tells you:
The type of position fix currently calculated by the unit:
NO FIX: no signals available
DR FIX: (Dead Reckoning) the position is estimated
based on the last known track, ground speed, and
position
2D FIX: the position fix is calculated based on signals
from only three satellites and GPS altitude is not
available
3D FIX: the position fix is calculated based on signals
from four or more satellites, and GPS altitude is
available
The total number of operational or “good” GPS
satellites in orbit
Navigating a Trip Apollo 360 GPS Receiver
4-2 P/N 560-0123-01