Garmin GPSMAP 238

Garmin GPSMAP 238 ... split-screen capability so you can view your position and sounder information at the same time. Their high repetition rate for transmit pulse creates a sharper, more accurate image. These units are WAAS capable for greater accuracy and have built-in worldwide base maps with coastline detail, U.S. tide data, and inland features. They also accept optional data cards with Garmin's BlueChart marine cartography for additional detail.