Garmin Mobile for Smartphones - Turn your Smartphone into a savvy navigator with Garmin Mobile. As low as $99 — a one-time purchase gives you easy-to-use navigation anywhere, 24/7 Garmin Mobile XT comes preloaded on a microSD card that includes Garmin navigation software and launches automatically when the card is inserted into a compatible smartphone. Users can route to a specific street address or choose a hotel, restaurant, gas station, or any other location. Garmin Mobile XT doesn't require monthly fees or subscriptions and costs $99.