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Dead reckoning is feature that allows a vehicle navigation system to continue estimating the
vehicle location when the GPS system inside the vehicle is unable to receive signals from
GPS satellites. Dead reckoning is performed by monitoring the speed and direction of the
vehicle to keep track of position relative to the last known location.
Installing the GPS Gyro
The gyro tells the navigation system (U-blox GPS module) when your vehicle makes a turn.
The gyro is set for horizontal mounting of the CPU Box at the factory. However, an angle-
mounted CPU Box can not track turns if the gyro is not set properly.
When the MW810 is ordered with a GPS Dead Reckoning option, the gyro wired to the U-
blox GPS module needs to be situated in accordance to the installation position of the CPU
Box.
The gyro sensor should be mounted perpendicular to the navigation plane.
The following sections show 4 optional gyro orientations for all CPU Box installation
positions. Note that once the CPU Box is open, no tools are required for changing the gyro
position.
Installation, Configuration and Calibration
When installing the CPU Box, do not exceed + -5 degrees tilt angle from
!
all vehicle axis. Installing the CPU Box over + -5 degrees tilt angle from
one or more of the vehicle axis may result in gyro reading error while in
DR mode.
Caution
+ 5
- 5
Appendix A
of GPS Dead Reckoning
Tilt angel range example
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