There are still some known deficiencies with the decoding of C-MAP
charts. Apparently there are deviations from the standard in the charts themselves as well.
Please identify the name of the chart in question (from within opencpn) and the precise name of the C-MAP
dataset, make some screenshots with/without currents (with the commercial
programme in question) if at all possible, and then post the bug here
(this thread is monitored by the lead developer).