WARNING: This product contains a non-replaceable lithium-ion battery.
See the Important Safety and Product Information guide in the product box
for important battery safety information.
WARNING: Always consult your physician before you begin or modify any
exercise program. See the Important Safety and Product Information guide
in the product box for product warnings and other important information.
Step 1: Use the Touch
Bezel
The silver bezel around the watch
face acts as a multifunction button.
Tap: quickly press your nger on the
bezel to make a selection, toggle a
menu option, or change pages.
Touch and hold: hold your nger on
one of the four labeled areas on the
bezel to switch modes.
Double press: press two ngers on
two areas on the bezel to turn on the
backlight.
Touch and drag (scroll): press your
2 Forerunner 405CX Quick Start Manual
nger on the bezel and drag it around
the bezel to scroll through the menu
options or to increase or decrease
values.
Page 3
Touch Bezel Areas and
Buttons
➊
➎
➋
➍
➏
➌
➊
time/date: touch and hold to
enter time/date mode.
➋
GPS: touch and hold to enter
GPS mode.
➌
menu: touch and hold to open
the menu page.
➍
training: touch and hold to enter
training mode.
Forerunner 405CX Quick Start Manual 3
➎
start/stop/enter:
Press to start/stop the timer in
•
training mode.
Press to make a selection.
•
Press to exit power save mode.
•
➏
lap/reset/quit:
Press to create a new lap in
•
training mode.
Press and hold to reset the timer
•
in training mode.
Press to exit a menu or page.
•
Press to exit power save mode.
•
Page 4
Bezel Tips
Touch the bezel rmly.
•
Touch the bezel on the outer ring,
•
where the words appear, not the
inner ring near the watch face.
Make each bezel selection a
•
separate action.
Do not rest your nger or thumb
•
Power Save Mode
After a period of inactivity, the
Forerunner switches to power save
mode. The Forerunner is inactive
if the timer is not running, you are
not navigating to a destination and
viewing the navigation page, and
you have not pressed any buttons or
tapped the bezel.
on the bezel while using it.
Do not wear thick gloves while
•
using the bezel.
If bezel is wet, wipe the bezel dry
•
before using it.
Locking the Bezel
To prevent accidental bezel taps (due
to moisture or inadvertent bumping),
press enter and quit simultaneously.
To unlock the bezel, press enter and
quit simultaneously again.
4 Forerunner 405CX Quick Start Manual
While in power save mode, you
can view the time of day, turn on
the backlight, and use the ANT+™
computer connection. To exit power
save mode, press the enter or quit
button.
Page 5
Step 2: Charge the
Battery
Your Forerunner ships with the
power off to conserve the battery.
Charge the Forerunner for at least
three hours before using it.
Contacts
NOTE: To prevent corrosion,
thoroughly dry the charging
contacts and surrounding area
before charging.
TIP: The Forerunner will
not charge when outside the
temperature range of 32°F–122°F
(0°C–50°C).
To charge the Forerunner:
1. Plug the USB connector on the
charging clip cable into the AC
adapter.
2. Plug the AC adapter into a
standard wall outlet.
3. Align the charging clip posts with
the contacts on the back of the
Forerunner.
Forerunner 405CX Quick Start Manual 5
4. Clip the charger securely over the
face of the Forerunner.
Charging
clip
The length of time a fully charged
battery will last depends upon usage.
A fully charged battery can run the
Forerunner with GPS on for up to 8
hours. See the owner’s manual for
more information.
Page 6
Step 3: Congure Your Forerunner
The rst time you use your Forerunner, follow the on-screen instructions to
learn how to use the bezel, set your user prole, and congure the Forerunner.
Activity Class Chart
Training
Description
0No exercise--
1Occasional, light
exercise
215 to 30 minutes
3Once a weekApproximately 30 minutes
4Regular exercise
and training
545 minutes to 1 hour
61 to 3 hours
73 to 5 times per week3 to 7 hours
8Daily trainingAlmost daily7 to 11 hours
9Daily11 to 15 hours
10More than 15 hours
Activity Class Chart provided by Firstbeat Technologies Ltd., portions of which are based on Jackson et
al. Prediction of functional aerobic capacity without exercise testing. Medicine and Science in Sports &
Exercise 22:863:870, 1990.
6 Forerunner 405CX Quick Start Manual
Training
Training Time Per Week
Frequency
Once every two weeksLess than 15 minutes
2 to 3 times per weekApproximately 45 minutes
Page 7
The Forerunner uses your user
prole to calculate calorie
consumption. Using the table on
page 6, select 0-10 to set your
activity class.
If you are using an ANT+ heart
rate monitor, select Yes during the
conguration to allow the heart rate
NOTE: You cannot acquire
satellites in power save mode. To
exit power save mode, press enter
or quit.
1. Go outdoors to an open area. For
the best reception, make sure
the antenna of the Forerunner is
oriented toward the sky.
monitor to pair (connect) with your
Forerunner. See Step 5 for more
information.
Step 4: Acquire Satellite
Signals
To set the correct time of day and
begin using the Forerunner, you must
acquire GPS satellite signals. It may
take a few minutes to acquire signals.
NOTE: To turn off the GPS
receiver and use the Forerunner
indoors, touch and hold GPS.
Select Off for GPS.
Forerunner 405CX Quick Start Manual 7
2. Touch and hold
training mode.
3. Stand still and do not begin
moving until the locating satellites
page disappears.
When you are receiving satellite
signals, the GPS icon appears in
the training mode pages.
Antenna
location
training to enter
Page 8
Step 5: Pair the Heart
Rate Monitor (Optional)
Tab
Heart Rate Monitor Strap
Slot
Heart Rate Monitor (Front)
Electrodes
Heart Rate Monitor (Back)
While you are trying to pair your
heart rate monitor with your
Forerunner for the rst time, move
10 m away from other heart rate
monitors.
The heart rate monitor is on standby
It should be snug enough to stay in
place during your run.
1. Push one tab on the strap through
the slot in the heart rate monitor.
Press the tab down.
2. Wet both electrodes on the back
of the heart rate monitor to create
a strong connection between your
chest and the transmitter.
3. Wrap the strap around your chest
and attach it to the other side of
the heart rate monitor.
NOTE: The Garmin logo should
be right-side up.
4. Press
5. Bring the Forerunner within range
quit or enter to exit power
save mode.
(3 m) of the heart rate monitor.
The heart rate icon appears
on the training mode pages.
and ready to send data. Wear the
heart rate monitor directly on your
skin, just below your breastplate.
8 Forerunner 405CX Quick Start Manual
Page 9
Step 6: Go for a Run!
1. Touch and hold training.
2. Press
3. After completing your run, press
4. Press and hold
start to start the timer.
stop.
reset to save your
run data and reset the timer.
Step 7: Download Free
Software
ANT Agent™ allows you to use your
Forerunner with Garmin Connect™, a
Step 8: Pair Your
Computer and
Forerunner
NOTE: Before connecting
the USB ANT Stick™ to your
computer, you must download
software as instructed in Step 7 so
that the necessary USB drivers are
installed.
1. Plug the
an available USB port on your
computer.
USB ANT Stick into
Web-based training tool, and Garmin
Training Center®, a computer-based
training tool.
1. Go to www.garmin.com
/forerunner405/owners.
2. Follow the on-screen instructions
to download and install ANT
Agent.
Forerunner 405CX Quick Start Manual 9
2. Bring your Forerunner within
range (3 m) of your computer.
Page 10
3. WhentheANTAgentndsyour
Forerunner, ANT Agent displays
the unit ID and asks you if you
want to pair. Select yes.
4. Your Forerunner should display
the same number ANT Agent
displayed. If so, select yes on
your Forerunner to complete the
pairing process.
Use Garmin Connect or Garmin
Training Center to view and analyze
your data.
Resetting the
Forerunner
If your Forerunner is locked up,
reset your Forerunner. Press and
hold enter and quit simultaneously
Step 9: Transfer Data to
Your Computer
Bring your Forerunner within range
until the screen goes blank (about 7
seconds). This does not erase any of
your data or settings.
(3 m) of your computer. ANT Agent
automatically transfers data between
your Forerunner and Garmin
Connect or Garmin Training Center.
NOTE: If you have a lot of data,
this may take a few minutes.
Forerunner functions are not
available during data transfer.
10 Forerunner 405CX Quick Start Manual
Page 11
Product Registration
Help us better support you by
completing our online registration
today. Go to http://my.garmin.com.
Keep the original sales receipt, or a
photocopy, in a safe place.
More Information
For more information about the
functions and settings of the
Forerunner, refer to the owner’s
manual.
CAUTION: The Forerunner is
not intended to be used while
swimming. Swimming or
prolonged water submersion can
cause a short in the unit, which
can in rare cases result in a minor
skin burn or irritation in the area
of the unit.
Forerunner 405CX Quick Start Manual 11
Page 12
Garmin®, the Garmin logo, Forerunner®, Dynastream®, Garmin Training Center®, and Virtual Partner®
are trademarks of Garmin Ltd. or its subsidiaries, registered in the USA and other countries. Garmin
Connect™, ANT™, ANT Agent™, ANT+™ , and USB ANT Stick™ are trademarks of Garmin Ltd. or its
subsidiaries. These trademarks may not be used without the express permission of Garmin. Firstbeat and
Analyzed by Firstbeat are registered or unregistered trademarks of Firstbeat Technologies Ltd. Other
trademarks and trade names are those of their respective owners. This product was produced under the
following United States patents and their foreign equivalents. EP1507474 (A1), US7460901, EP1545310
(A1), US7192401 (B2) and U20080279. WO03099114 (A1) (Pat. Pend.), EP1507474 (A1), US7460901
(B2), WO2004016173 (A1) (Pat. Pend.), EP1545310 (A1) (Pat. Pend.), U20080279 (Pat. Pend.)
For the latest product information and accessories, visit the Garmin Web site at www.garmin.com.