That 541 is a beautiful unit! I came close to buying a 421 for this new boat, but I had just bought a GPSmap 76Cx last year with my local bluechart so I passed it up for just a Fishfinder 90 to give me depth and temp. Sorry, no info on mounting the thru hull transducer (mine is transom mount), but here is a pic of where I mounted my Fishfinder 90 in my new H180.


And while I'm at it, here is the Richie compass that I mounted in the factory depth finder location. Just an idea for you, or anybody else with an H180.
