94 Chapter 7 Learn Geode Connect for Android
Geode GNS3 Real-Time Sub-Meter GPS Receiver
■ GPS Only: Enabling this option tells the receiver to only
accept signals from GPS satellites. It stops receiving all
GNSS signals as long as this box is checked. This may
be a useful option in open areas with little interference,
particularly if the user is trying to preserve battery life.
■ Mixed: Enabling this option (default) tells the receiver to
use all GNSS satellite signals available to calculate the
position solution. This includes non-GPS satellites, which
do not have DGPS or SBAS corrections. Certain NTRIP
services do provide corrections for non-GPS satellites. For
most applications, Mixed is the best choice, particularly if
there is a lot of interference.
■ NULL NMEA: This option is available because different
navigational apps interpret NULL messages differently. As
a default, when the Geode loses its position (cannot get
a fix), it sends out a NULL NMEA message. Some apps
interpret this NULL message to mean that the Geode’s
position is (0°, 0°), which is west of Africa in the Atlantic
Ocean. If the app you are using starts showing your
position as (0°, 0°), deselecting this option will most likely
correct the problem.
■ SBAS Ranging: When this option is enabled, it tells the
receiver to treat SBAS satellites as GPS satellites. Doing
so has the potential to speed up the initial position fix.
However, SBAS satellites operate in a time system distinct
from that of the GPS satellites, so a position solution that
includes SBAS satellites may be less accurate than a GPS-
only or GNSS-only solution. The recommendation is to
enable this option to speed up the initial position fix and
to disable it for improved accuracy.
■ SureTrack: This is proprietary technology that improves
the Geode’s sub-meter, sub-foot, or decimeter precision
and accuracy. The recommendation is to always leave this
option checked.
■ Tunnel: This option enables faster reacquisition after
coming out of a tunnel. Use it as needed.
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