Quick start manual
Astro320QuickStartManual 9
➊
VHF antenna
➋
Collar
➌
GPS antenna
➍
Power key
NOTE: The backlight brightness may
be limited when the remaining capacity
in the batteries is low.
Extensive use of screen backlighting
can signicantly reduce battery life.
1. Press and quickly release .
2. Use the Rocker to adjust the
brightness levels.
TIP: You can also press and
quickly release to cycle through
the brightness levels.
3. Press ENTER to select a brightness
level and close the menu.
• Turn on the DC 40 and allow it to
acquire satellites before you put the
DC 40 on your dog. This allows the
DC 40 to acquire satellite signals
much faster.
• Bring extra AA batteries for your
Astro.
• Use a fully charged DC 40. A
fully charged DC 40 operates for
approximately 17 hours when using
ve-second interval reporting.
• Use line-of-sight radio
communication (page 10).
• The Astro can track up to 10 dogs
with DC 40 collars. Only three dogs
can be viewed at one time on the
Dog Tracker page. To reduce the
text size, press MENU, and select
Small Numbers.
• Go to www.garmin.com/products
/astro for more information and
www.garmin.com/astro for a
tutorial.