1000 Feet with a Garmin?

[jcunningham]

I bought the Garmin 440s, and I'm having trouble in deep water.
It drops off to 4500' a quarter mile off shore, and just after 1000' the sonar goes crazy, it changes the depth to a couple feet and gives shallow water alarms. We also tend to see a lot of fish once this starts. I can't find any thing in the manual about a max depth, and even if it is 1000' why does it change to shallow depths and show lots of fish?

I email Garmin and they didn't respond.

 

[achris]

Re: 1000 Feet with a Garmin?

I've looked up the specs on your unit and I think I may have the answer you're not looking for..... power, or lack of it....

http://www8.garmin.com/manuals/1540_OwnersManual.pdf

This is a link to the owners manual... Go to the specifications page in the appendix....

Under SONAR it does state the depth as 1500 ft.... and that's in optimal conditions.

The reasons it changes to the shallower depth is because it's guessing. It cranks the gain to max and then sees all the rubbish in the water as fish or a shallow bottom.... Change the range and gain to manual and see if that improves things...

Chris.........

 

[waterinthefuel]

Re: 1000 Feet with a Garmin?

Not to be rude, but does it really matter? I mean, are you really going to be able to fish bottom in 1000' of water?