What is Autorouting on Garmin Receivers?
Autorouting is a feature where you can simply request a destination and the
gps receiver will calculate the path to the destination and guide the user to
the destination with explicit turn data. In order for
autorouting to work the receiver needs a map of all of the roads that are
available and the database used to produce the map requires much more data than
just the connections between the turns. For example it needs to know if the
street is a one way street, if left turns, or for that matter if any turns, are
permitted at a give intersection, and much more very specific routing data. For
this reason, a receiver that supports autorouting will not be able to autoroute
without a suitable map database. In addition it needs to know additional data to
make an informed opinion on what might be the best route to use when there are
multiple choices. The speed limit for each segment of the road is an example of
this kind of information. Freeway interchanges make the routing job even worse
since the turn is often in a different direction that the final desired
direction. Given the amount of complicated calculations it is pretty amazing
that any handheld can do a decent job of computing a route automatically.
The Baja Navigator does
not contain autorouting data.