Yes, the 798ci HD SI Combo, 898c SI Combo, 899ci HD SI Combo, 998c SI Combo, 999ci HD SI Combo, 1198c SI Combo, 1199ci HD SI Combo include advanced GPS capabilities with the built-in Humminbird ContourXD™ base map that contains over 3,000 lakes.  The 698ci HD SI Combo, 598ci HD SI Combo and 398ci HD SI Combo utilize the Humminbird Unimap base map.  

The 798ci HD SI Combo, 898c SI Combo, 899ci HD SI Combo, 998c SI Combo, 999ci HD SI Combo, 1198c SI Combo, 1199ci HD SI Combo are compatible with Humminbird LakeMaster, Navionics  ®   Silver, Gold and Premium HotMaps  ™   cartography. In addition the 898c SI Combo, 998c SI Combo, 999ci HD SI Combo, 1198c SI Combo, 1199ci HD SI Combo  are compatible with the revolutionary Navionics ®   Platinum and Platinum Plus ™ cartography.