Install the resetnet profile so the 2.4 ghz is like it was from factory.
Then click the drop-down in the network SSID to see the Wi-Fi in range, and note what channel and strength are around you.
Then you can see which channels in your boat are strong and avoid them.
Most systems default to channel 1
If that is what you are seeing, then you want to move to channel 6 or 11 as they will have the least overlap.
Then install the swap Wi-Fi profile again, and then you can change the 2.4ghz Wi-Fi channel to 6 or 11, which will have less interference.
Alternatively, just try changing to 6 or 11 to see if it helps right away.