Lowrance iWay 600C 5-inch Portable GPS and Marine Navigator and Chartplotter Built-in, precision 12-parallel channel GPS+WAAS receiver Pre-loaded with complete NAVTEQ maps for continental United States and Canada Maps can be updated through the internal USB port with a PC Windows XP, ME, 2000, or Macintosh OS X 30GB internal hard drive, with 25GB of storage dedicated to high-detail mapping and satellite imagery 5GB of storage reserved for MP3 audio files (20GB for Western Europe models) Completely sealed to prevent internal corrosion Full one-year warranty