Hello everyone!
I would like to present, my recent two packs. These assets are made for mobile platform, but can be used in indie PC games too 
Long story short, there are 2 boat types: Pirate and Modern.
Each team has 5 ships and few small props/assets.
In future, there is a plan to make more assets for each set, if the pack will be successful.
Pirate Ships: https://www.assetstore.unity3d.com/en/#!/content/99905
Modern Ships: https://www.assetstore.unity3d.com/en/#!/content/100335