Humminbird Side Imaging Forums

General => General Discussion => Topic started by: rwkamx on May 24, 2013, 07:20:47 PM

Title: Depth reading off alot
Post by: rwkamx on May 24, 2013, 07:20:47 PM

I was in 5.5 feet anchored and looked at the HB and it is reading 21 ft this has happened twice..... restored to factory default and still same measurements...... turned on and off same false reading ...
  then it changed on its own to the correct depth...Anyone have a clue about this problem??? Thanks!!!!!!!!

Title: Re: Depth reading off alot
Post by: rnvinc on May 25, 2013, 10:55:33 AM

Did it show a consistant 21ft depth over time or just a few seconds at the incorrect depth...??

Several things can cause an intermitant incorrect depth...water turbulence, algae bloom, un level xducer, floating debris on xducer...etc....

Check the xducer for abnormalities..

Also, If you suspect particulate in the water, you can increase the surface clutter setting to help filter this out...

Rickie

Title: Re: Depth reading off alot
Post by: Humminbird_Greg on May 28, 2013, 10:57:57 AM

I would also make sure that there was not another sonar unit on at the same time as the cause could be sonar interference causing this (turning on and up the Noise Filter menu can help this).

Where is the transducer(s) mounted?
Are you suing only the HDSi transducer or a two transducer system?

Title: Re: Depth reading off alot
Post by: ITGEEK on May 28, 2013, 12:43:34 PM

Interference can cause erratic depth readings.
If this happens again, turn off everything on the
boat except the sonar in question, and see if it clears up.

Also, I have to ask:
Is it possible you were anchored on a ledge, or on the outside of
a hole, where your anchor was in 5.5 feet of water, but the transducer was
looking down over the ledge or into the hole?