Off - sets the smart antenna to operate in GPS mode only.
Max Age -sets the maximum age limit that the last received RTCM correction will be
applied to the satellite range measurement in the receiver. The default setting is
600 seconds. The MX51x will accept values from 10 to 999 seconds. Due to the
removal of the S/A dithering from the satellite signal, you may now use values of
600 seconds in the maximum age and still be very accurate.
Message 16 Alarm - sets the alarm to On or Off if a reference station text message is
received. The default setting is Yes. Received (Type 16) beacon messages can be
displayed on the GPS7 screen, regardless of the alarm setting.
Alarm For No Corrections - sets the alarm to on or off if DGPS corrections are not
received within the Max Age. The default setting is Yes. If the alarm is set to Yes,
you will notice that the MX51x drops out of DGPS mode and into the mode selected
in DGPS Mode described earlier in this section at the same time the alarm sounds.
Alarm on health change - Sets the alarm to On or Off if a satellite becomes unhealthy or
unusable.
WAAS/EGNOS enabled - sets the source of differential correction to come from satellite
based augmentation system such as US-WAAS or European-EGNOS system.
Although this systems are available, they are still non-IMO compliant. Use of these
differential correction sources should be done with great caution.
External DGPS Enabled - gives the user the capability to accept RTCM SC-104 corrections
from an external beacon unit (receing the Coast Guard or a Private Beacon
Reference Station). The MX51x allows you to control the baud rate of SC-104
Data input port. The following baud rates can be used: 2400, 4800, 9600 or 19200
Bauds.
WAAS/EGNOS and External RTCM are available only for the MX521A, MX525A smart
antennas or MX575A GPS Compass. The MX421-10 GPS smart antenna can use external
RTCM correction only.
DR - Dead Reckoning
The DR (Dead Reckoning), is an added navigation feature of the MX51x in the event that
there is no GPS positioning available. This feature requires external speed log and heading
sensor inputs to work properly. When the DR setting is set to ‘Yes’ and appropriate compass/
heading and speed log sensors are connected and activated, the MX51x will automatically
switch to DR calculation when the GPS positioning becomes unavailable. A DR icon on the
top right corner of the display indicates that the position displayed is derived from DR
calculation.
To set the DR to ‘Yes’ , scroll down to DR menu then press the EDIT key. Press the ENT
key to activate the ‘Change’ softkey. Press the EDIT key again to exit the edit mode.
Dual Control - Dual Station Control
This screen sets the functional control between two or more MX51x CDU’s in a LAN
network. The default setting is No. When this selection is changed to Yes, one MX51x is
set to Master, the other MX51x is set to Slave. Up to five MX51x units can be networked
together using the LAN port. The MX51x connected to the antenna is normally the
Master unit and the other member/s can be either slaves or repeaters. The Slave
unit/s will share a common waypoint and route database with the master. It can also
make changes in some of the configuration settings. A slave unit can be made into
a Repeater. Repeaters only act as a display unit. They cannot be used to change
configuration settings. Once an MX51x is set as a repeater it will require a special
password (which is set by the Master unit in CFG1/Security) to change it back to a slave.
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