Garmin 21 FM TMC User Manual

GTM™ 21 OWNER’S MANUAL

The Garmin® GTM™ 21 FM TMC Traffic Receiver
receives Traffic Message Channel (TMC) information
broadcast over the FM radio data system. When a traffic
message is received, your Garmin GPS device displays
the incident on the map and can change your route to
avoid the traffic incident. For coverage areas, refer to the
Garmin Web site at www.garmin.com/fmtraffic.

NOTE: The FM traffic receiver and GPS

device must be in data range of an FM station
transmitting TMC data to receive traffic
information.

NOTE: Garmin is not responsible for the

accuracy of the traffic information. The FM
traffic receiver simply receives signals from
the traffic service provider and shows that
information on your Garmin GPS device.

Service Information

When you are in an FM TMC service area in the UK, your
GTM 21 receives traffic signals as soon as you connect
it to your Garmin GPS device. You need to be in range
of an FM station transmitting TMC (Traffic Message
Channel) data to receive traffic information. You do not
need to subscribe to a traffic service; your GTM 21 works
automatically.

When you are outside the UK, your GTM 21 receives free
FM TMC data available in the area. You can also add FM
traffic subscriptions for other areas. Check the Garmin
Web site at www.garmin.com/fmtraffic for other available
services.

May 2006 Part Number 190-00659-91 Rev. A Printed in Taiwan

Connecting Your GTM 21

1. Remove the power cable from your Garmin GPS

2. Connect the cable on the GTM 21 to the power
connector on your Garmin GPS.

To 12-Volt receptacle

in vehicle

Power

LED

Status

Route on windscreen using the

suction cups.

Antenna

LED

To power connector

on Garmin GPS

The Status LED indicates the status of the GTM 21:

Check the Map: Check the map on the GPS device for
traffi c incidents. Refer to the owner’s manual.

Verify Signal Strength:

radio signals cannot be received, you may need to take the
vehicle outside.

Yellow dot-dash fl ashes: determining

which country you are currently in.

Yellow solid light: searching for signal.

Red solid light: momentary sync loss.

Green solid light: normal traffi c data.

If you are inside a garage where

3. Plug the other end into a 12-Volt receptacle.

4. Use the suction cups to route the antenna
horizontally or vertically on the windscreen. For
best signal reception, route it vertically.

5. Route the cable so that it does not interfere with
vehicle operating controls.

Testing the GTM 21

Observe the LED on the GTM 21: When the GTM 21 is
connected to power, the Power LED is on. The GTM 21
may take up to fi ve minutes to acquire data.

Verify that you are in a service area:

from the pay service or free services.

Using Traffi c Data with Your Garmin
GPS Device

The GTM 21 works with your Garmin GPS device to
show traffi c fl ow and incident information and enable
routing around traffi c incidents. Although each GPS
device operates differently, they all provide similar traffi c
information.

Check for service