Structure Scan Issue

Wondering if anyone can help me out with a structure scan issue I’m having on my new Lowrance HDS 12 gen 2 touch. It will run for a second or two and then freeeze for quite a while, then run for a second or two and then freeze. On and on.

Here is what I have:
HDS 12 is connected to: LSS-2 (transom), Xi5 via nmea 2000, universal 2d sonar of xi5 (bow).
Humminbird 899 connected to: non hd transducer (transom) for 2d.

Seems to be a settings or transducer issue because my chart refresh rate is great, does not seem to be a processor issue. Found some info on a message board about a possible issue when trying to run structure scan without a transom 2d sonar transducer. The HDS may be continually searching/pinging for the 2d signal. Yesterday that would have been on the xi5 that was not deployed. That may make sense because the temperature reading I was getting had to be an air temp for the xi5 universal sonar.

I have the humminbird for the sole purpose of 2d off of the transom, so I have no need to have 2d on the HDS. Is there a way to unplug it and completely turn off 2d? Then my water temp reading should default to the LSS-2 transducer, correct?

I could be wrong, but I don’t know if the structurescan transducer will have a temp reading. I thought only the 2D ones did. I guess I will have to look.
Try removing temp from our data overlay and see if the lag still occurs. Might lend some credibility to your thought about “searching” for the 2D transducer if it stops lagging.

I didn’t think so either on the LSS-2 having a temp sensor but multiple forums online said it does so I went and read the description:

Made for multiple mounting locations, the Lowrance® LSS-2 StructureScan® HD Sonar Imaging Skimmer® Mount Transducer features a low profile, low drag design and offers a built-in water temp sensor.

I should also add that I get an accurate water temp reading from the humminbird transducer so I don’t need it from the lowrance unit.

You have a bit of a different scenario than my setup because you have a Bird and Lowrance (I have 3 HDS units), but one thing that caused me fits was “network sonar”. Man, did I wrestle with that and which “source” I had being used. I ended up disabling the network sonar to get it work how I wanted. This wouldn’t be the problem for you since your Bird wouldn’t be networked with the Lowrance.
That is a bit perplexing though why you get that lag. Does it happen regardless of sidescan, downscan, etc?
So, does this lag only happen when the xi5 is stowed? Or does it happen when its in the water too?
You shouldn’t get any readings from the xi5 when its stowed because the power is disabled when its in the stowed position. So any temp reading you had then would have had to come from the LSS2.

I’ll have to see when I go out next time if it’s happening on downscan as well. I’m confused as well, I had the trolling motor plugged in but I never deployed it. I never thought to deploy the xi5 and see if that fixed the issue because it didn’t even cross my mind that the 2d sonar could be screwing up the structure scan. And I can’t think of many times when I’d want the trolling motor deployed for structure scanning.

The temperature reading on my HDS unit was showing 50-55 degrees which was the air temperature. The temp reading on my humminbird was showing 34.5, which would seem to be an accurate water temp.

If the temp reading on the HDS was coming from the LSS-2 then I have a transducer issue because it would be 20 degrees off.

When I updated the software on the HDS unit, it said it was updating the software on the xi5 as well, this happened while it was plugged in but not deployed, then I had to unplug the xi5 to power off and plug it back in.

I’m wondering if the HDS unit can access the xi5 universal sonar if it is plugged in but not deployed. That’s the only way I can think that I would get that temp reading of 50-55.

Regardless, when I go out next time I will have the xi5 universal sonar disconnected from the HDS, I will see what happens. But from what I am reading I may still have to alter a setting because it could still be trying to actively search for a 2d signal.

Disabled the 2d sonar and my Structure scan and down scan are both fully operational now.

Now to actually catch a fish in the new boat!