Acura 2015 RDX Manual page 96

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Driving Off-road
If you leave all mapped (digitized) roads, the system automatically starts displaying a
series of dots (breadcrumbs) to track the path you are taking. If needed, you can
follow the dots back to the mapped road you originally left.
P. 60
2 Off-road Tracking
Driving to Your DestinationViewing the Route
1 Driving Off-road
A message "Not on a digitized road" may appear
when you drive half a mile away from a mapped
road.
Breadcrumbs may occasionally be displayed in
urban areas, such as large parking lots in
shopping malls, in new subdivisions where the
roads are not yet in the database, or in areas
where a GPS signal is unavailable, such as in a
parking garage.
Off-road tracking breadcrumbs are limited to
approximately 150 miles. Breadcrumbs at the
beginning of the trail are deleted if you exceed
that distance.
Breadcrumbs are displayed only at 1/20, 1/8, 1/4,
and 1/2 mile map scales.
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