Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Ship/Yacht Collection #2 Free.
ShipYacht Collection 2 v1.0
This is a set of 15 yachts and sailboats. All ships share a texture atlas to reduce draw calls. Each ship is around 500 triangles and is suitable for mobile devices.
Included is a 4096×4096 texture atlas, and also a 512×512 texture (w/ alpha channel) for the flags and antennas.