[Conn SVX]

Magellan GPS I needed the external antenna. I have used 3 different Garmin and no issues. I don't do up grades, I buy a new one every 3 years or so. Technology gets better every few years. I up grade the whole system that way. Upgrade gives you recent gas station, hotel, store name changes and locations. Roads stay basically in the same place. I have mine mounted all the way to the left of my windshield , tucked in the corner next to the pillar.