Sail Boat Repairing
You have to repair the Sail Boat before it can be used. Repair materials can be obtained through gathering and producing.
Boat Driving
After you repair the Sail Boat and finish the corresponding quest, you can go near the boat and tap the Drive button to sail it. Operate the left rocker to control the Sail Boat.
When you meet a shark in the sea, a Harpoon button will appear on the bottom right corner of your screen, you can tap the Harpoon button to attack the shark.
Parking and Disembarking
You can operate the left joystick to park the boat next to a shore. When the boat is stationary, you can tap the disembark button to get off the boat.