Hi,
a while back HB released an update for SI boxes called “Jigging mode”. There had been endless chatter SI boxes lost their 2D signal quality after update 6.490. I think Jigging mode came in around update 7.510 for my 998 CSI.
Here is a quote from Deborah
“””
Jigging Mode – is a selection in the 2D Sonar Express Menu. It allows the user to select the sonar ping pattern for use while vertical jigging. When turned ON the ping pattern will be: 200 kHz, Left SI Beam, Right SI Beam, 83 kHz, repeat. With this mode turned OFF the ping pattern will be: 200 kHz, Left SI Beam, Right SI Beam, 83 kHz, Left SI Beam, Right SI Beam, repeat. Basically this feature prioritizes the 2D beam over the SI beam.
Deborah @ Humminbird
“” Is your box up to date???? If not give it a try.
Roger