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54 Astro 320 and DC40 Owner’s Manual
Customizing Your Device
◦ On Road For Distance
(requires routable maps)—
calculates on-road routes that
are shorter in distance.
◦ Prompted—asks you to select a
routing method before the route
is calculated.
• Follow Road Method—allows you
to select a transportation method in
order to optimize your route.
• Lock On Road—locks the
position icon, which represents
your position on the map, onto the
nearest road.
• Off Road Transitions—available
only for some activities.
◦ Auto—automatically routes you
to the next point.
◦ Manual—allows you to select
the next point on the route.
◦ Distance—routes you to the
next point on the route when
you are within a specied
distance of your current point.
• Avoidance Setup—(available only
for some activities) allows you to
select the road type you want to
avoid.
From the main menu, select Setup >
Marine.
• Marine Chart Mode—allows you
to select a nautical chart or a shing
chart:
◦ Nautical—displays various map
features in different colors so
that the marine POIs are more
readable. The nautical chart
reects the drawing scheme of
paper charts.