Garmin Etrex 10,20,30 Owners Manual

eTrex Owner’s Manual 41
Device Information
Specifications
Water 
resistanceRugged plastic, 
waterproof to IEC 60529 
IPX7
Battery type 2 AA batteries,  
(alkaline, NiMH, lithium, 
or precharged NiMH)
Battery Life Up to 25 hours
Operating 
temperature
range From -4°F to 158°F 
(-20°C to 70°C)
About the Batteries
‹ WARNING
The temperature rating for the device 
(page 41) may exceed the usable range 
of some batteries. Alkaline batteries 
can rupture at high temperatures.
Do not use a sharp object to remove...

42 eTrex Owner’s Manual
Device Information
Long-Term Storage
When you do not plan to use the 
device for several months, remove the 
batteries. Stored data is not lost when 
batteries are removed.
Caring for the Device
notice
Avoid chemical cleaners and solvents 
which can damage plastic components.
Cleaning the Device
1. Dampen a clean cloth with a mild 
detergent solution.
2.  Wipe the device with the damp 
cloth.
3.  Thoroughly dry the device.
Cleaning the Screen
1. Dampen a soft, clean, lint-free...

eTrex Owner’s Manual 43
Device Information
Data Management
NOTE: The device is not compatible 
with Windows® 95, 98, Me, or NT. It is 
also not compatible with Mac® OS 10.3 
and earlier. 
File Types
The device supports these  file types.
•  Files from BaseCamp
™ or 
HomePort™
Go to http://www.garmin.com .
•  GPI custom POI files from the 
Garmin POI Loader
•  GPX geocache files
Installing a  microSD Card
The eTrex 20 and eTrex 30 can use 
microSD cards for additional storage. 
Also, some maps are...

44 eTrex Owner’s Manual
Device Information
4. Place the microSD card ➋ in the 
device with the gold contacts facing 
down. 
5.  Close the card holder.
6.  Slide the card holder toward the top 
of the device to lock it.
7.  Replace the batteries ( page 7).
8.  Replace the battery cover, and turn 
the D-ring clockwise.
Connecting the Device to a 
Computer 
notice 
To prevent corrosion, thoroughly 
dry the mini-USB port, the weather 
cap, and the surrounding area before 
charging or connecting to a...

eTrex Owner’s Manual 45
Device Information
4. Open the “Garmin” or memory card 
drive/volume.
5.  Select  Edit > Paste. 
TIP: You must put geocache files in 
the Garmin\GPX folder.
Deleting Files
notice
If you do not know the purpose of 
a file, do not delete it. Your device 
memory contains important system 
files that should not be deleted. Be 
especially cautious of folders entitled 
“Garmin.”
Before you can delete files, you must 
connect the device to your computer 
(page 44).
1. Open the “Garmin”...

46 eTrex Owner’s Manual
Appendix
Appendix
Optional Accessories
Optional accessories, such as mounts, 
maps, fitness accessories, and 
replacement parts, are available at 
http://buy.garmin.com or from your 
Garmin dealer.
Optional  Maps
You can purchase additional maps, 
such as BirdsEye satellite imagery, 
Garmin custom maps, Inland Lakes, 
TOPO, BlueChart g2, and City 
Navigator maps.
Optional Fitness Accessories
Fitness accessories are available for 
the eTrex 30. Before you can use the 
fitness...

eTrex Owner’s Manual 47
Appendix
Tips for Pairing ANT+ Accessories 
with Your Garmin Device
• Verify that the ANT+ accessory 
is compatible with your Garmin 
device.
•  Before you pair the ANT+ 
accessory with your Garmin device, 
move (33 ft. or 10 m) away from 
other ANT+ accessories.
•  Bring the Garmin device within 
range (10 ft. or 3 m) of the ANT+ 
accessory.
•  After you pair the first time, your 
Garmin device automatically 
recognizes the ANT+ accessory 
each time it is activated. This 
process...

48 eTrex Owner’s Manual
Appendix
Data FieldDescription
Barometer The calibrated current 
pressure.
Battery Level The remaining battery 
power.
Bearing The direction from 
your current location 
to a destination.
Cadence  
(cadence 
accessory 
required) Revolutions of the 
crank arm or strides 
per minute.
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 or 
meters per...

eTrex Owner’s Manual 49
Appendix
Data FieldDescription
Glide Ratio to 
Dest. The glide ratio 
required to descend 
from your current 
position and elevation 
to the destination 
elevation.
GPS Signal 
Strength The strength of the 
GPS signal.
Heading The direction you are 
moving.
Heart Rate  
(heart rate 
monitor 
required) Your heart rate in 
beats per minute 
(bpm).
Location  
(lat/lon) Displays the current 
position in the default 
position format 
regardless of the 
selected settings.
Location...

50 eTrex Owner’s Manual
Appendix
Data FieldDescription
Speed - 
Overall Avg. Your average speed 
since last reset.
Sunrise The time of sunrise 
based on your GPS 
position.
Sunset The time of sunset 
based on your GPS 
position.
Time of Day The current time of 
day based on your 
time settings (format, 
time zone, and 
daylight saving time).
Time to 
Destination The estimated time 
needed to reach your 
final destination.
Time to Next The estimated time 
needed to reach the 
next waypoint on the 
route....