GP1870F Depth Range

[Anonymous]

i troll areas in the shallows that have sandbars and am looking to buy the GP1870F and having trouble finding how shallow the 1870 will read? I don't want to get stuck on a sandbar.
If I read correctly the 1870 in one range will read down to 0, is this correct?
Thanks
LL

 

[Snips]

Lagoon Lizard,
Good question. The scale starts at 0 but that doesn't mean the sounder will read that shallow. A sounder that uses only one transducer will have a dead spot right at the zero mark due to the ringing of the transducer. We have never really tested the sounder for this. However I know a gentleman who is using an 1870 on a jet boat in a river so I have asked him to see how shallow it will read. He will be going fishing in the next day or day so we will see what he reports.

Snips

 

[Snips]

Lagoon Lizard,
Below is a screen shot of the 1870 in shallow water (2.2ft). This system was set up for fishing and not for shallow water detection. He was using a 1kw transducer which is to much power for shallow water. But if you look at the main bang (zero line) and if you were using it on low power I will comfortable that the GP-1870 would show the bottom at 1ft, maybe less. Hope this helps.

Snips

 

[Snips]

Lagoon Lizard,
Below is another screen shot of the GP-1870 using a lower power and gain setting. The screen shot shows a depth of 2ft but you can see he was a little shallower a short time before.

Snips