Help needed TZT & Airmar 275LHW

A

Anonymous

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Hoping someone will be able to provide some assitance with an issue I am having on the vessel I captain. I will try to be as detailed as possible.

Vessel: Viking 70EB 2015
Units: Furuno TZTBB
Sounder Module: DFF1UHD
Transducer: Airmar TM 275 LHW Through Hull

Issue: My sounder works admirably in shallower water (<500ft) and marks bait and fish well when the bottom is visible on the screen. If the bottom isn't on the screen (example depth 600ft, range set at 500ft) then I mark vary little. A lot of my fishing is done deep for marlin and tuna, say 3000ft plus, and I am only interested in showing the top 250' of water. When I set my range to this depth I mark very little, even when I know for a fact there is plenty of bait and fish underneath me (FAD fishing). Can anyone explain why this is? And how I could remedy the situation.

Thank you in advance.
 
Grand Duke,
Thank you for your question. Is the UHD in an Auto or manual TX Rate? If in Auto try a setting of Manual 20.

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