I have a Garmin 152 w/external antenna. Not that old but I might want to replace it with a 162 or 172 to get cartographic capabilites. Does anyone know if these units use the same antennas? Running the antenna cable though the bowels of the boat was easily the hardest part of the installation.<br /><br />I'll check the website, but my batting average on getting decent answers (or any answers) from "ask us a question" on manufacturer's websites is not good.