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Astro 320 and DC40 Owner’s Manual 39
Navigation Tools
2. Press MENU.
3. Select Adjust Zoom Ranges.
4. Use the Rocker to set the zoom
range on the vertical axis.
5. Use the Rocker to set the zoom
range on the horizontal axis.
1. Go to a location where the elevation
or barometric pressure is known.
2. From the main menu, select
Setup > Altimeter > Calibrate
Altimeter.
3. Follow the on-screen instructions.
Proximity alarms alert you when
you are within a specied range of a
particular location. A tone sounds when
you enter the designated radius.
1. From the main menu, select Tools
> Proximity Alarms > Create
Alarm.
2. Select a category.
3. Select a location.
4. Select Use.
5. Enter a radius.
After you set the proximity alarm, you
can customize tones (page 48).
1. From the main menu, select Tools >
Proximity Alarms.
2. Select an alarm.
3. Select Delete > Yes.
1. From the main menu, select Tools >
Area Calculation > Start.
2. Walk around the perimeter of the
area you want to calculate.