I would suggest running upstream first when you get to a river. When running upstream you can stop(as long as the water is deep enough) and hold position while you scout out the best way. When running downstream you have to run faster then the current or it will direct where you go. One small rock in your grate will cause you to lose most of your power. Learning to back down shallow or tricky spots is a big plus. Tilt your motor up a little and practice backing down. It is the same principle that a drift boat uses, manuvering by objects using the angle on the current. Good luck!