Ice Fishing Tips -Check your local regulations! > Ice Fishing With Electronics
LX5 Reads too deep
Baetis62:
I've had this one for about 8 years and its been a great unit but tonight I was playing around with it and noticed when I hung the ducer over the concrete floor it read 7-8 feet when the thing was about 2 feet above the slab. Zoom wasn't on. 20' range and turning gain up and down didn't change anything. Thought it was strange so I checked connections, tried a different ducer and a fresh battery...same deal. It's working fine otherwise. Sound familiar to anybody?
HWeber:
I'm pretty sure that's normal, someone else can chime in and confirm or let me know I'm an idiot
DR.SPECKLER:
They wont read accurate depth out of water.none of my flashers/sonars do.
Baetis62:
Didn't think of that Doc...water is denser than air so it makes sense...Speaking of dense :P...
Nitz:
These sonar instruments do not directly measure depth, they time how long it takes the ping to return. That time is then converted/displayed as a depth thru water for us (the user). Sound travels faster thru water than it does thru air.
The speed of sound thru air is ~343 m/sec. The speed of sound thru water is ~1480 m/sec. The ratio should be ~.232 = (343/1480). So to test the depth reading thru air --> Hold the transducer puck steady & level at an elevation of 25 inches over a hard surface, the unit should read a depth thru air of approximately 9 feet (b/c the unit is designed to read thru water).
I perform this test each year before I hit the ice - these specific test numbers (25 inches & 9 feet) are just easy to recall. You could do the math to test other distances.
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