Founder of the The Wargame Bootcamp (https://www.boardgamegeek.com/guild/962)
My hero Grumpy Bonaparte
Sadly now the only way to get ship mats is to buy another core set.
Ares have said they will print new items that will be available in summer 2018.
I still can’t see that confirmed in their web page :-(
Hopefully this will change.
When did they start including mats with the core (Starter Sets)? I check the website and does not list them as part of the Starter Set