The 200kHz 2d transmit cannot be shut off in any of the CORE series HB units (except by turning off ALL sonar on a specific unit) ...

So it doesn't matter if the 1197 is "viewing" SI/DI ... It's still transmitting 200kHz 2d for digital depth (as has been noted already) ...

There will be crosstalk interference with both HB units sonar on ...regardless if using the stock xducer or the US2 xducer ...

How bad the crosstalk is can only be determined by trying them ...

Rickie