Sorry for such a late reply on this one - I was hoping someone else might answer who has actually tried using Apex data. All I can say is that we haven't had any reports of Apex data not importing, but that may be because no one is using one with ReefMaster yet. If the Apex is still compatible with Autochart on the PC, then I would guess that the relevant file formats remain unchanged and the sonar logs should still work OK with ReefMaster.