Texas GPS Satellite Map Cards : The TX TRAX cards are High Resolution GPS Map Cards that replace the basic Navigation Maps on your Marine GPS Unit. The TX TRAX SD Card covers all of the Texas Coast from Louisiana to Mexico. All TX TRAX cards include Aerial Imagery, Buoys and Beacons, Fairway Tracks, Obstructions, Channel Markers and more. All of these overlays can be turned on and off on most GPS Units. The Aerial Satellite Images are the most recent imaging available. TX TRAX includes Zoom Levels from the entire state of Texas down to 1 m/px. Overlays of Fairway Tracks, Buoys and Beacons, Obstructions. Channel Markers and More are included. These Overlays are directly from NOAA's most recent Navigation charts. Currently only available for Lowrance and Simrad. Garmin coming soon!