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gant - console based ANT+ information retrieval client for Garmin GPS products


gant [ OPTIONS ]


gant is a small command-line utility to retrieve information (sports tracks, etc.) from
Garmin GPS products over the wireless ANT/ANT+ protocols. Currently supported devices are
the Forerunner 405.


-a authfile
Provide authfile (default ~/.gant).

-f name
Assign a name to the ANT device. (default garmin)

-d devno
ttyUSB devno Device no. (default 0)

-i id ID for pairing (default random)

-m mydev
(default 0)

-p Passive

-v Verbose

-D level

-r Reset the device

-n Do not write auth file

-z Do not pair

Help options
-h Show command line options.


Put 405 in pairing mode gant -f paul -a auth405

This gives your garmin a name of "paul" and an auth file of "auth405" The 405 will ask you
if you wish to pair with "paul". Obviously you might want to use a different name :)

Download with: gant -nza auth405 > output

or -Dnza if you want lots of debug output

It doesn't seem to be very reliable at starting the download and I haven't investigated
why yet. So, if it doesn't start downloading press ctrl-c and try again. I find it helps
to take the watch out of power save mode.

If you've already downloaded the data, then you'll need to set "force send" to yes on the

Compare output with .TCX file produce by windows ANT Agent.



1. plugin your ANT+ stick 2. the system will load the kernel module "cp210x" 3. to find
out what ttyUSB device is used run

# dmesg|grep "cp210x converter"
[...] cp210x 3-1:1.0: cp210x converter detected
[...] usb 3-1: cp210x converter now attached to ttyUSB3

In this case you have to use the optione "-d 3". If it is ttyUSB0 then you don't need the
-d option because 0 is the default 4. put the watch into paring mode (menu ->
configuration -> ANT+ ->
computer -> pairing on) 5. pair the computer with the watch ("mywatch" as name for the
watch and
the file "auth405" as an authorization file which will be created)

# gant -d 3 -f mywatch -a auth405

6. download saved tracks from the watch

# gant -d 3 -f mywatch -nza auth405

You get the possible options with

# gant -h

To convert the downloaded TCX file (e.g. 2011-07-22-123456.tcx) you can use gpsbabel:

# gpsbabel -t -i gtrnctr -f 2011-07-22-123456.tcx -o gpx -F 2011-07-22-123456.gpx

-- 2011-07-22 Noèl Köthe <[email protected]>


Wireless ANT communications happens over a USB2ANT dongle. Under Linux the dongle is
driven by cp210x kernel module, and presented to user-space as a USB serial port,
/dev/ttyUSBxxx where xxx is an integer. The dongle is typically carrying the USB vendor
id/product id pair of 0fcf/1004 or 0fcf/1008. Recent Linux systems employ udev to handle
device nodes and permissions, thus appropriate

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