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5.7.2 Heading Lock
In the Field 5
– The Start is useful for calculating the cross-track error and other
navigation information.
In the Navigation module, the software uses the angle between the last
two GPS positions to calculate your heading. If you are not moving, or
are moving too slowly, the software cannot calculate the heading.
When this happens the heading is locked. This may occur in the
Direction Dial screen or in the Road screen.
When the heading is locked the message Heading locked starts flashing
in the message area, alternating with the message Start moving. The dial
or road, the heading arrow on the map, and any values in the Info
panels that depend on the heading, freeze. Info panels that depend on
the heading include Bearing, Turn, ETA, and Time to Go. When you
start moving fast enough for the Asset Surveyor software to calculate
a reliable heading, the heading display becomes active again.
Note – When you are using autonomous GPS, the heading is locked
when your velocity drops below 0.65 meters/second (2.34
kilometers/hour). With differential GPS the minimum velocity is 0.35
meters/second (1.26 kilometers/hour).
5.7.3 Navigation Options
Press the&softkey in the Navigation module to open the
Navigation options form. You can use this form to set options for both
the Direction Dial screen and the Road screen. You do not have to be
in a navigation mode to change its options; for example, you can open
the Navigation options form from the Direction Dial screen and use it
to change the road scale for the Road screen.
Use the Navigation options form to select a close-up range and style
for the Direction Dial screen, a road scale for the Road screen, and
Info panels for both.
TSC1 Asset Surveyor Operation Manual 127