Garmin's sales soared by 20% year over year in the first quarter. Garmin (GRMN 12.05%) reported its first-quarter earnings today and investors saw a lot to like. The maker of wearables, activity trackers, and other high-tech outdoor adventure devices saw sales soar 20% compared to last year's first quarter. Investors jumped into the stock in response. Garmin stock had already moved higher by nearly 50% over the last year, and it jumped by another 11.7% today, as of 11:15 a.m. ET. Garmin stock keeps running ...