When I use Edit option for my tracks - sometimes pings are below or above bottom-line. True, possible to fix. Should I fix all channels? For example map-source for Autochart is 200khz channel. What is in RM? It's possible to choose? What is default source?

Thanks.

ReefMaster takes depths from the primary channel, typically 200KHz, or from the next available channel if primary is not available.

Thank You Matt.
When I want to use DI channel as source - It's possible when I move it up , on primary channel place? Or need split channels in another software which allow to choose import/export channels from SL2/3)
DI data are more clear and handle to fix

It doesn't matter which channel you use to correct depths. Depths are already imported from the primary channel, and these ones will be updated when depths are corrected, regardless of which sonar channel they are displayed over during the correction process. In general it appears that there is no difference to the depths that are imported across channels - e.g. DS depths in the sonar log are the same as primary channel depths and they are probably derived in the same way on the unit, so there is no point in importing and storing them separately.

Thanks a lot.
Last time I tried to use Sonar TRX feature to create bottom line and export file with this data it as .csv to RM- negative result, needs to buy add function.
Lakemaster Autochart have auto- correction data - wery usefull, but no export option and no way to transfer it to RM
Data correction is very important, maps looks different, best accuracy as can be. If You plan to add new features in future auto correction data is very handfull.