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Euler considers the following problem: A boat with a perfect rudder moves atconstant speed across a stream flowing in straight fillets at assigned speeds.Assuming that the downstream velocity of the boat equals that of the river, howshould the rudder be set so that the boat traverses a given path? He works outvarious instances, one of which gives rise to a variational problem, in detail.(From Clifford Truesdell's An idiot's fugitive essays on science: methods,criticisms, training, circumstances.)

An annotated translation from Latin of L. Euler's 'On the motion of boats propelled by oars in rivers'