4
Astro and DC 40 Owner’s Manual
Customizing Your Device
Marine Page
If you are using optional marine charts
or marine maps, you can customize
how the map displays the marine
features.
Marine Colors
—enables marine
colors on the map.
Spot Soundings
—enables spot
soundings that indicate depth
measurements on the map.
Light Sectors
—sets navigational
light locations to
On
,
Off
, or
Auto
(the location appears when the map
pointer passes over it).
Symbol Set
—allows you to
select the map symbol set:
Auto
,
GARMIN
,
NOAA
, or
International
.
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routing Settings
From the main menu, select
Advanced
>
Settings
>
Routing
.
Guidance Method
—allows you
to select a guidance method for
calculating your route.
Prompted
—asks you to select a
routing method before the route
is calculated.
Follow Road
—creates a route
that overlays the roads on the
map.
Off Road
—creates a point-to-
point route.
Follow Road Method
Prompted
—asks you to select
a follow-road method before the
route is calculated.
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