You have it right. While right now some ferry operators are just checking passports, they have the right as a private business to protect their employees. At the very least that means masking, which they are doing.

I spoke with one ferry operator yesterday that told me it would not be a bad idea to bring the Emed tests down in case something changes during our trip this coming week.

So since we have the tests, why not pack them, just in case? Not probable, but possible.