There's no way I can quantity the processor demand on different applications the ONIX is running ...

But my eye sees a small boost in performance from using a Chart Select map of my lake instead of the LakeMaster regional card ...

It's a given that the Chart Select map has less overall data to process (only 1 lake data per SD Card) ... But I don't have verified documentation that states LakeMaster regional cards slow down the performance ...

It just "seems" like my Chart Select map card helps (both my ONIX and my 1197) ...

Rickie