
76 | Keypad & Display Descriptione
Whether a unit is a slave or repeater, it will still share a common waypoint and route
database as the master. Refer to Appendix C for more detailed information about the
dual-control and multiple unit control setup and operation.
CFG1/LAN menu must be setup before enabling the Dual-Control feature. A dual control
system consists of one Master and one Slave. A Multiple Unit Control (MUC) system
consists of one Master, at least one Slave (maximum of two), and up to three (if any)
Repeaters. A multiple unit control system must contain a minimum of three MX51x and a
maximum of ve MX51x units altogether.
In a Multiple Unit Control conguration, this option must be enabled (by changing Dual
Control to Yes) for all Slave and Repeater units before enabling it in the Master unit.
MX51x Dual Control Menu
GPS - Elevation Mask Control
This screen controls the elevation mask angle, or the angle above the horizon, at which
the MX51x will attempt to track a satellite. Satellites with an elevation below this angle
will be tracked but will not be included in the position solution. You can set the elevation
limit to any value up to 90°. For most marine applications, the default limit of 5° is
appropriate.
The Antenna Offset allows you to virtually offset your antenna location. That is, if you
are forced to place the antenna in a location other than where you want your position
fix calculated (due to superstructure or other high power antennas), you can place the
antenna in a practical location. Then enter the appropriate Antenna Offset, and the
MX51x will calculate your position in the place where you would have preferred to place
the antenna.
The RAIM menu is available only in MX51x models where the RAIM feature is enabled. For
more detailed information about RAIM, please refer to Page 67 of this manual. Standard
MX51x CDU will only show the Elevation mask and Antenna offset menu items.
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