Humminbird helix g3 10 combo unit with 10inch  screen comes with quad transducer. 2 yers old used but is as new. Includes navionics mapchip and over 400 perth  recorded local waypoints. excellent sidescan capabilities and has in built contour mapping which records your depth as you travel and permaantly embeds the depth into your map chip permanently. Expandable memory for mapping  by using extra map chip for unlimeted recording mapping details. Reason for sale I have purchased a larger 16 inch Apex model.