Do the traffic receivers have to be hooked up through the radio antenna or do they just lay on the dash and receive signals?
The GTM 10 needs to be installed to connect through your antenna (Garmin recommends a professional, but it may not be that hard to do). The GTM 12 just plugs into the unit's USB connection. A lot of the other GTM units are actually in the car charger connection itself. Which ever one you are thinking about purchasing, make sure that it's compatible with your GPS. They are not all interchangeable (due to the connection that they use).
Here's a link to all of the traffic receivers.
A lot of the other GTM units are actually in the car charger connection itself. Here's a link to all of the traffic receivers.
That's interesting - I'd not realised that the 'European' GTM 21 is totally different to the GTM 20. (Maybe because Garmin say 'it's similar' )
https://buy.garmin.com/shop/shop.do?cID=203&pID=413# (I assume that link works from the US)
I'm amazed that the GTM 20 works at all, without any form of external aerial/antenna!
I actually have a GTM 20 (it came with my Streetpilot 550). My 3 month trial ran out, but it actually worked rather nicely. I live in an area that the map shows as having VERY sporadic coverage, and that's pretty much what I got. However, when I went into the City (Philly and Baltimore) I didn't have any reception problems at all. My cigarette lighter is fairly low in my car too. I was even surprised when I went to Harrisburg, PA and had traffic reception there as well, considering they aren't even on the coverage map at all.
I didn't bother getting the annual service since I don't go into the cities all that frequently, but once things are $60 for a lifetime, I'll definitely have to think about getting it.
Thanks, from the picture it looks like all you have to do is plug the GTM 12 into the Nuvi and stick the suction cups holding the antenna, to the windshield. Right?
Additionally, the Nüvi needs to be receiving power from its rear cradle connector. (It won't work, just using its own internal battery - no idea why this should be the case.)
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