Product Description

Save drive time fuel and your sanity by adding traffic services to your compatible Garmin with the help of the Garmin TMC GTM 21 a portable FM traffic receiver. Avoid Traffic Congestion Similar to the Garmin GTM 20 the Garmin GTM 21 TMc is an integrated FM TMC (Traffic Message Channel) traffic receiver antenna and cigarette lighter adapter. Designed exclusively for the European version of compatible Garmin products it receives digital information (where available) on traffic and road construction tie-ups and sends it to your Garmin device to offer an alternate route. TMC data is available in a fast-growing number of cities throughout Europe and gives prompt accurate notification of accidents road construction police or emergency action etc. so you can visually monitor traffic flow and if necessary avoid traffic congestion and jams. Plug and Drive The Garmin TMC GTM 21 is a fully portable plug-and-play design that uses a 12-volt cigarette lighter adapter. No professional inst

Product Details

• Amazon Sales Rank: #15612 in Consumer Electronics
• Brand: Garmin
• Model: 010-00566-02
• Released on: 2007-05-02
• Dimensions: .99 pounds

Customer Reviews

Garmin GTM 21
If your Garmin GTM 21does not receive Trafficmaster ,Check with UK Garmin tech support, they can talk you through identifying the GTM21 serial # and then will tell you whether yours actually has the free licence with it
If the cable was not destined for the uk it will not have the free licence .The cable will connect with the
pigtail folded up so if you cannot receive traffic it is unlikely to be reception ,contact Garmin for them to check if you have a uk cable
Good luck
If all fails you can buy the licence for $60 from Garmin US site

UPDATE April 2009 just purchased this cable as a second car installation
original came with the 770
key to working is to ensure you install the Garmin firmware updates,
recent one has now transformed the reception .S Devon to London and return only lost signal briefly twice on whole trip and same driving round Dorset You need the Garmin Web updater prog and it is simple
Now a Great product well done Garmin ( at last )

Depends on the windscreen
I used a Garmin 660 with this traffic receiver in an old Toyota Corolla for almost a year with excellent results. Traffic information regularly received and numerous holdups avoided.

When the Toyota finally curled up its toes, I switched to a (slightly) newer Renault Megane and was disappointed to find I was no longer receiving traffic updates. The difference? The Megane's windscreen has a UV filter coating which blocks the signal. A few weeks ago I managed to pick up traffic on one occasion in west London - presumably I was driving past the transmitter at the time.

Wondering now whether the traffic aerial can be extended to boost the signal received...

Garmin satnav excellent - GTM 21 TMC Traffic receiver USELESS
I have had this kit for six months on two units and have yet to receive any traffic data whatsoever. Tried it all over the south of England, up the M1, outside and inside the car - you would be better advised to hang a piece of wet string out the window! The Garmin 510 satnav is excellent however.