AT processing is done on the module, same as LVS. So the Head Unit doesn't have a large effect (if any) on the image you see. The new units have better screen materials and glare reduction technology and stuff like that, but the signal/data is all going to come from the module.
AT2 and HDS Pro does offer the new (well, not new, it's been out for a few years) screens that take advantage of dual AT2 setups, and also the abitliy to sync the transducers to reduce interference. However, what Lowrance won't tell you is you can also do this sync with the Live Head units as well, you just don't get the fancy menu option.
Obviously, Carbons and Live are EOL or well past EOL, but if you already have one that is working fine, or you find a really good deal on one - there's really no need move to the HDS jsut for Active Target - unless you want to use two AT2 units and one of the dual screens mentioned above (there are several, see below...)
When I was running AT2, I already had HDS Pro's so did consider adding a 2nd AT2 so I could get that Scout Wide view - which is essentally a Mega 270 Live Sonar. But, due to the way Lowrance forces you to mount the two AT2 transducers, you are locked into that config. So if you wanted to switch one of them to Forward view, the mount wouldn't work. You would have to actually unbolt the tranducer and put it on completely separate mount (or run a 3rd AT2 I suppose on it's own mount). Big Fail from Lowarnce imo. I do believe if they had made the mount able to rotate one of the transducers, they would have sold a lot more AT2's specifically for that setup. And since there was not a lot of interest, I don't think any aftermarket companies worked on a better mount either, like they have for the single mount ie Fish Obesessed, Jones, Precision Sonar, etc.
Anyway, I decided instead to switch to LVS-34 and add a Mega360 and sold the AT2. While AT2 and LVS-34 are somewhat closer in peformance than they used to be, in Forward/Down at least, LVS-34 is still on top, and smokes the AT2 in Scout/Perspective, which is why I switched. In Florida, I use it a lot scanning beds around grass and it is worlds better than AT2's Scout mode.
![[Linked Image]](https://i.postimg.cc/jqFbK22t/screenshot-302.png)