Re: Ducer mounting with speed wheel
I don't think it makes any difference. I have an older Impulse which has the spped wheel that snaps onto the back of the transducer. I also have (but not installed) an older thru-hull brass 120 MHz transducer that has an insert through the middle of the unit with the spped wheel. I have also seen Garmin units with the speed wheel built into the transducer. Just about all the transduecers are built by AIRMAR. Send them an e-mail and they will tell you what they reccommend. They have always responded to me in 2-3 days. They also have Q&A page, but I don't remember seeing that question posed. <br />I am installing a new unit on my boat, got a transducer mounting plate from Cabels, so I can patch the old holes with Marine-Tex and start over again and will 0nly have 2 holes to drill into the hull. The plate is a 4"X12"X 3/4" starboard, cost about 10 bucks.