Thread: Riveted hulls and H'bird fish finding ability on plane

If the 2d is keeping good bottom detection and bubbles from the rivets are not causing problems...then there are a few things that can help with arches at faster speeds...(tho still not guaranteed..)

Use the wider 60° 83kHz beam or the 83/200kHz beam...to keep the fish in the larger cone longer...

Go under the "Sonar" tab and adjust the "standalone" 83kHz sensitivity up...

Set Switchfire to "Max" mode and then adjust the sensitivity to where the screen clutter is tolerable...(maybe even a little more clutter than you would normally run)...

Turn the chart speed up to the max setting...

You might even turn the RTS sonar window to "Wide"... where you can see the fish echoes in the RTS..if a fish "blips" in the RTS window...there should be an arch in the 2d immediately...

Rickie

Originally Posted by rnvinc

If the 2d is keeping good bottom detection and bubbles from the rivets are not causing problems...then there are a few things that can help with arches at faster speeds...(tho still not guaranteed..)

Use the wider 60° 83kHz beam or the 83/200kHz beam...to keep the fish in the larger cone longer...

Go under the "Sonar" tab and adjust the "standalone" 83kHz sensitivity up...

Set Switchfire to "Max" mode and then adjust the sensitivity to where the screen clutter is tolerable...(maybe even a little more clutter than you would normally run)...

Turn the chart speed up to the max setting...

You might even turn the RTS sonar window to "Wide"... where you can see the fish echoes in the RTS..if a fish "blips" in the RTS window...there should be an arch in the 2d immediately...

Rickie

I usually have it set on 83/200. However the 83 sensitivity is set at 5.

Switchfire is normally on Max and sensitivity is set on the high side, around 15 if possible.

The chart speed is always on 5. I will try increasing it.

I never use the RTS window, would this actually help?

Originally Posted by Trout Bum

I usually have it set on 83/200. However the 83 sensitivity is set at 5.

Switchfire is normally on Max and sensitivity is set on the high side, around 15 if possible.

The chart speed is always on 5. I will try increasing it.

I never use the RTS window, would this actually help?

The RTS window will not affect the arch in the 2d ...but it will tell if, in fact, there are fish that are entering the sonar cone...

The RTS is a "vertical flasher" with little to no filtering or processing of the sonar echoes...

If there are no "blips" showing in the RTS window ... Then you are just not running over fish...

Rickie

Also try maxing the "standalone" 83kHz setting under the Sonar tab...and then adjust the "Main Sensitivity" setting in the Xpress window to an acceptable clutter level ...

This will make the 60° 83kHz cone "hotter" than the default "blend" of the 83/200kHz ...

Rickie

Exactly how fast are you going while on plane while trying to scan for fish?

I don't even have to be on plane. When I hit about 2000 rpm the screen gets a lot of interference on it (a lot of small dots) along with the bottom contour, which actually appears as a weaker signal than at less rpm.

Have you tried adjusting your noise filter in the settings? Only other thing would be to try to add rf chokes and/or reroute the transducer cable.

Have you tried the menu settings that Rickie suggested?
Do you have a screen snapshot of what fish do look like when you are at planning speeds?
Is there another sonar unit on at the same time as your 958c HD unit?

Make sure that this is not some sort of electrical interference by taking your motor out of gear and revving it up past 2,000 RPMs (where the dots and all start to show up). If you start seeing the same dots and all your problem may be interference from the motor.