The SLC Assessment is a practical on-the-water assessment of your skills. It will take about 6 hours on the water. The assessment documents are PDF downloads and are available to students in their curriculum under OTW Assessments. For the SLC Assessment, download the SLC/ICC/Bareboat Charter Assessment document. Make sure you read the instructions on that document. Then take a look through the document prior to the assessment and inform your assessor of any areas you are weak on.
There is an on-boat written exam as part of the assessment. Make sure you are strong on plotting on a chart with current and leeway, identifying ATONs, predicting tides with rule of twelves, weather symbols, rules of give way, and other basics.
This is a different exam than the SLC multichoice exam online.