4
Astro and DC 40 Owner’s Manual
Customizing Your Device
Customizing Data Fields
1. From the map, trip computer,
compass, altimeter, or highway
page, press
MENU
.
2. Select
Change Data Fields
.
3. Select a data field.
4. Select an option.
Data Field Options
Data Field
Description
Accuracy Of GPS The margin of error for
your exact location.
For example, your
GPS location is
accurate to within
+/- 12 feet.
Ambient Pressure The uncalibrated
environmental
pressure.
Ascent - Average The average vertical
distance of ascent.
Ascent - Maximum The maximum ascent
rate in feet/meters per
minute.
Data Field
Description
Ascent - Total
The total elevation
distance ascended.
Barometer
The calibrated current
pressure.
Bearing
The direction from your
current location to a
destination.
Course
The direction from your
starting location to a
destination.
Descent - Average The average vertical
distance of descent.
Descent -
Maximum
The maximum descent
rate in feet/meters per
minute.
Descent - Total
The total elevation
distance descended.
Distance To Dest. The distance to your
final destination.
Distance To Next The remaining
distance to the next
point on the route.
Elevation
The altitude of your
current location above
or below sea level.