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Product Description
Manufacturer's Description
The GTM 21 is an integrated FM TMC (Traffic Message Channel) traffic receiver, antenna and cigarette lighter adapter. It receives digital information (where available) on traffic and road construction tie-ups that your compatible Garmin unit uses to offer an alternate route. The sleek GTM 21 features a new compact design.
Product Description
SP Garm Zumo GTM21 kit
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Most Helpful Customer Reviews
8 of 8 people found the following review helpful:
5.0 out of 5 stars
Garmin GTM 21,
By
This review is from: Garmin GTM 21 (UK) FM TMC Traffic Receiver (Electronics)
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 )
7 of 7 people found the following review helpful:
3.0 out of 5 stars
Depends on the windscreen,
By Nigel (Buckinghamshire) - See all my reviews
This review is from: Garmin GTM 21 (UK) FM TMC Traffic Receiver (Electronics)
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...
12 of 13 people found the following review helpful:
1.0 out of 5 stars
Garmin satnav excellent - GTM 21 TMC Traffic receiver USELESS,
By
This review is from: Garmin GTM 21 (UK) FM TMC Traffic Receiver (Electronics)
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.
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