ArcGIS for Maritime: Charting at 10.6 boasts some significant geoprocessing enhancements to their tools.
Convert AML Format now has a 3.0 version, with a capability to produce 1.0, 2.1 and 3.0 versions from the same dataset or geodatabase.
The Export Geodatabase To S-57 geoprocessing tool has the capability to clip or not clip features that cross an M_CSCL.
Several changes have been to made to the Nautical DNC toolbar.
You will also see several changes done to the Save Surface Model and Save Surface Model As dialog boxes.