Use the mouse or one finger to rotate the world, scroll or pinch to zoom. Right-drag to pan. The top-view button shows the mechanism directly above.
For a manual upstream voyage, open the lower gate, enter, close it, open the inlet to fill, then open the upper gate and exit. Reverse the route for a downstream voyage. The interlocks will warn you about unsafe sequences.
The Run guided passage control performs a complete hydraulic cycle using the same validated gate and sluice commands.