Translation system for an outboard and inboard tender with respect to a garage of a ship, wherein the garage comprises a floor (Pa), a ceiling and at least one side wall extending at least as far as next to a door (Po), provided for the passage of said tender and arranged on a plane essentially orthogonal to said ceiling, wherein said tender when idle rests on said floor (Pa) and has its longitudinal vertical median plane parallel to said at least one side wall, the translation system comprising: - at least first support and straight-line guide means, comprising a first support and guide section (11.1) suitable to be fixed with respect to said at least one side wall and arranged in use parallel to said ceiling; - first electro-mechanical dragging means; - at least one first slide provided with a second integral support and guide section (12.1), and which is able to slide along said first section (11.1) of said first support and guide means, wherein said at least one first slide is controlled in translation with respect to said first support and guide means by means of the first electro-mechanical dragging means, between a rest position, wherein in use said at least one first slide is contained in the area of said at least one side wall, and a working position, wherein in use said at least one first slide is partially extended beyond said at least one side wall through said door (Po); - lifting and lowering means for said tender with respect to said floor (Pa), movably supported with respect to said at least one first slide and comprising a hinged support arm (14.1) supported, at one end (14.2), by means of an articulation with a vertical axis and supporting, at the other end (14.3), electro-mechanical hoist means; wherein said arm (14.1) is configured to rotate around said vertical axis between a rest position, wherein it is next to said at least one first slide arranged in use parallel to said at least one side wall, and at least one working position, wherein in use said support arm (14.1) is oriented in a direction orthogonal to said at least one side wall, and wherein said support arm (14.1) in said at least one working position is selectively arranged in use, along said at least one first slide, inside said garage and outside said garage beyond said door (Po), respectively. - at least first support and straight-line guide means, comprising a first support and guide section (11.1) suitable to be fixed with respect to said at least one side wall and arranged in use parallel to said ceiling; - first electro-mechanical dragging means; - at least one first slide provided with a second integral support and guide section (12.1), and which is able to slide along said first section (11.1) of said first support and guide means, wherein said at least one first slide is controlled in translation with respect to said first support and guide means by means of the first electro-mechanical dragging means, between a rest position, wherein in use said at least one first slide is contained in the area of said at least one side wall, and a working position, wherein in use said at least one first slide is partially extended beyond said at least one side wall through said door (Po); - lifting and lowering means for said tender with respect to said floor (Pa), movably supported with respect to said at least one first slide and comprising a hinged support arm (14.1) supported, at one end (14.2), by means of an articulation with a vertical axis and supporting, at the other end (14.3), electro-mechanical hoist means; wherein said arm (14.1) is configured to rotate around said vertical axis between a rest position, wherein it is next to said at least one first slide arranged in use parallel to said at least one side wall, and at least one working position, wherein in use said support arm (14.1) is oriented in a direction orthogonal to said at least one side wall, and wherein said support arm (14.1) in said at least one working position is selectively arranged in use, along said at least one first slide, inside said garage and outside said garage beyond said door (Po), respectively.