[TG] [TG11] Element 9HV Bad Sonar Readings

[Tom - Raymarine - Moderator]

Hello chicityyaker,

This looks like Second Echo interference to me. This is a phenomenon that can happen when you have:

• flat water conditions
• a strong bottom echo
• a sensitive sounder
  

I've written a description of what's happening on this FAQ.

To make this less prevalent you can turn on or increase the values of Menu > Settings > Sounder > Interference Rejection and 2nd Echo rejection. To eliminate it completely at the expense of slower scrolling you can decrease Ping rate limit in the same menu. What reducing Ping Rate Limit will do is space out the pings that the sounder transmits and allow time for the echoes from the last ping to die away before listening for the next one. You will find that over the space of <5 increments in the Ping Rate Limit the 2nd echo interference will significantly reduce and then disappear completely. Use the highest Ping Rate Limit that you can and still remove the interference. You will find that the specific value that does this will depend on the depth in which you fish, but will probably be somewhere between 15 and 30.

This isn't a fault with the system, it's just an unavoidable result of the conditions and the sensitivity of the system and that it's trying to get as many pings into the water as possible for best sonar detail.

Regards,
Tom