Garmin™ GPSMAP® 76Cx Handheld Navigation Unit Garmin™ GPSMAP® 76Cx Handheld Navigation Unit original $349.99 Here are a few. This device features a high-sensitivity, WAAS™-enabled, SiRFstarIII™ GPS receiver for total accuracy. And a built-in, quad-helix antenna for superior reception. With a removable microSD card, so you can download information on cities, nautical navigation aids, US tide data, interstates, coastlines and handy points-of-interest locations, including: lodging, shopping, banks, businesses,