Idea of Water Transportation Icon
There are two curved and pointed parallel lines at the bottom of the image that resemble waves in water. There is a hexagon shape just above the parallel lines with two ovals near the top of the shape. On top of that shape is a rectangle with the top two corners cut out and a short line extending vertically.
This page shows the different variations of the Water Transportation from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.