Question about Garmin GPS
The problem is that these units put out a very low level signal on FM. This is mainly due to restrictions and rules established by the FCC. The levels are such, so that they don't interfere with other nearby equipment or radios.
When you go to touch the unit, your arm is acting like an antenna, making the signal from your Nuvi propagate better to your car's radio.
If you are using a window mount, you are somewhat limited in what you can do. The closer you move the Nuvi to the car's antenna or radio, the better. Just for fun, try positioning the unit on the dash (while sitting still). Can you find a spot where it sits right over the radio that sounds the best with minimal noise? If so, you might want to get a friction mount and put your Nuvi on the dash, right over the radio.
Another thing you can try is getting a plug that fits in the headphone jack, like at Radio Shack, and soldering a couple feet of wire to ground lead of the plug. Plug the plug with the wire into the headphone jack. This is what manufacturers of consumer FM transmitters provide as a means to make an external antenna.
Posted on Dec 05, 2008
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Posted on Jan 02, 2017
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