A removable navigation system for a medical device configured for insertion within a lumen in a body, the removable navigation system comprising: a medical device; a sheath operatively configured to cover at least a portion of the medical device; a positioning sensor comprising an electromagnetic coil affixed within the material of the sheath; and a deformable fixation element disposed between the sheath and the medical device, the deformable fixation element configured to be operatively deformed to temporarily fix a position of the medical device relative to the sheath and positioning sensor, wherein the sheath comprises a first opening, a second opening, and a lumen therebetween, wherein the first opening, the second opening, and the lumen are each sized and configured such that a portion of the medical device may pass therethrough, wherein the electromagnetic coil is sized and configured such that a portion of the medical device may pass through the electromagnetic coil, wherein the electromagnetic coil is configured to produce a signal that can be interpreted by a signal processing unit, and wherein the deformable fixation element comprises one of the following (i) a shape memory alloy, (ii) a pressurized ferrule, (iii) an expandable and collapsible element, preferably an inflatable balloon, wherein preferably the inflatable balloon surrounds the medical device or an array of small balloons is located circumferentially, (iv) a mechanical locking device, and (v) an electromechanical locking device. a medical device; a sheath operatively configured to cover at least a portion of the medical device; a positioning sensor comprising an electromagnetic coil affixed within the material of the sheath; and a deformable fixation element disposed between the sheath and the medical device, the deformable fixation element configured to be operatively deformed to temporarily fix a position of the medical device relative to the sheath and positioning sensor, wherein the sheath comprises a first opening, a second opening, and a lumen therebetween, wherein the first opening, the second opening, and the lumen are each sized and configured such that a portion of the medical device may pass therethrough, wherein the electromagnetic coil is sized and configured such that a portion of the medical device may pass through the electromagnetic coil, wherein the electromagnetic coil is configured to produce a signal that can be interpreted by a signal processing unit, and wherein the deformable fixation element comprises one of the following (i) a shape memory alloy, (ii) a pressurized ferrule, (iii) an expandable and collapsible element, preferably an inflatable balloon, wherein preferably the inflatable balloon surrounds the medical device or an array of small balloons is located circumferentially, (iv) a mechanical locking device, and (v) an electromechanical locking device. (i) a shape memory alloy, (ii) a pressurized ferrule, (iii) an expandable and collapsible element, preferably an inflatable balloon, wherein preferably the inflatable balloon surrounds the medical device or an array of small balloons is located circumferentially, (iv) a mechanical locking device, and (v) an electromechanical locking device.