If it's a micro boat, that's all you should need. However if you want a bit more voltage and current range then there is this, which is only marginally bigger. Both controllers are forward and reverse.
https://www.banggood.com/10A-ESC-Brushed-Speed-Controller-For-RC-Car-And-Boat-Without-Brake-p-966363.html?rmmds=detail-left-hotproducts&cur_warehouse=CN
Customer Reviews:
Got 2 of these for my WPL trucks. Just about the right size and power handling. Only used with the truck off the ground as I fit it in, but seems ok. Off-load it seems too fast at low speed, but once I put it on load the proportional speed handling should be more obvious. LED brightness varies with speed and flashes at the neutral position.
I bought 2 and they look very good - yet to test as I have to change plugs to suit my equipment. Note that the battery and motor plugs mate so I could cut off the power plug and use it to connect to the motor plug.
I purchased two ESC to mount on a small tank chassis and they are perfect, they are able to drive a motor in forward and reverse, there is no brake function but for it's not a problem with a tank chassis. Used with a 0.8A motor on 2S they are barely warm after 15mn. They have a 5V output BEC to power a RC receiver.
is is a very useful ESC for use in small model boats. Good responsive control, and 50% reverse helps prevent disasters with 'platic magic'.