good depth finder
 

looking for a good depth finder - my current lowrance cant handle more than about 10mph - would like one that works better at speed. thanks

Never seen any depth finder work over 10mph

My Airmar in hull will work at 50mph most times.

some is wrong then with your Lowrance or the transducer or the install . At one time thats all my dealerships would install because they were so reliable.

Which unit do you have and how old ? Have you hit your transducer and how is that installed ? they can not read air -- Is the transducer transom mounted or shoot thru the hull -- The can NOT read thru a cored hull FYI - has to be solid glass with no air bubbles between the laminates if the transducer is shooting thru the hull. Just saying

Transducers can't read through air. They need clean water under with no bubbles. If you want to read at speed it has to be placed so that is maintains clean water under. A stepped hul introduces water under the hull making it harder to find clean water.

Like mentioned it can read through fiberglass but not any material with air pockets. If mounting to read through the hull it is expoxied to the hull. No air bubbles in epoxy.

You can test it's location by temporarily attaching to hull and flooding area with water so it fill voids between hull and transducer. Then run at speed to test.

mine is mounted in antifreeze.

I have this one and it works great:

https://buy.garmin.com/en-US/US/p/530269

baby oil is the recommendation for the transducers to be submerged - including the airmans.