[DG11] Sonarchart Live, depth offset

[moki38]

So, this brings us back to my orginal question. As the Sonar unit (which is really a sophisticated depth transducer :-) ) has its own transducer, with its own waterline offset. It should be able to calculate the current depth, without the need of the depth transducer, right?

Then why does setting the normal depth transducer offset to below keel, change the depth massured on the Sonar transducer? It already had its own (below waterline) offset, but seems to ignore this or gets overwritten with the normal depth transducer offset?