Shearwater
Member
At the risk of being accused lazy for not finding out for myself......I have a GPSMAP 178 unit from a previous boat (less the transponder which was glassed in); I now have a boat with a 120XL installed. It seems the GPSMAP is a more advanced product, esp as it is loaded with Mediterranean (local) charts, so it would appear sensible to buy a new squark for the GPSMAP and sell off the 120XL. Does this meet with agreement or have I missed something..... I often do!