http://www.garmin-250.com/blog/2010/02/on-a-garmin-gps-c340what-is-the-difference-bw-using-a-traffic-antenna-gtm-10-versus-the-gtm-12-just/ Question and Answers about Garmin GPS Tue, 13 Jul 2010 00:43:47 -0500 http://wordpress.org/?v=2.8.4 hourly 1 http://www.garmin-250.com/blog/2010/02/on-a-garmin-gps-c340what-is-the-difference-bw-using-a-traffic-antenna-gtm-10-versus-the-gtm-12-just/comment-page-1/#comment-2362 gpsdude Thu, 04 Feb 2010 20:34:29 +0000 http://www.garmin-250.com/blog/2010/02/on-a-garmin-gps-c340what-is-the-difference-bw-using-a-traffic-antenna-gtm-10-versus-the-gtm-12-just/#comment-2362 The GTM10 has to be installed in the vehicle, meaning you have to pull the radio to install to the exterior antenna. The GTM 12 does not require the installation and is much easier to use. If you have a version prior to version 8, you may obtain the update disk from the garmin site. If you have version 8 already, there is nothing to update. The GTM10 has to be installed in the vehicle, meaning you have to pull the radio to install to the exterior antenna. The GTM 12 does not require the installation and is much easier to use.
If you have a version prior to version 8, you may obtain the update disk from the garmin site. If you have version 8 already, there is nothing to update.

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