A rowing apparatus comprising one or more riggers stationary relative to the rowing apparatus and a plurality of imaging devices, each of the imaging devices being for capturing images of a stroke of a respective one of a plurality of rowers while the rower is rowing in the rowing apparatus, and comprising: a mount to fix each imaging device on one of the riggers of the rowing apparatus and to align the imaging device such that each time the imaging device is mounted to the rowing apparatus, the imaging device is aligned substantially at the same angle, fixed substantially at or above a pivot point of the rower's oar for recording side elevational view images of the rower and the rower's oar, and does not move relative to the rowing apparatus during the rower's stroke; a set of at least two lenses (8, 10) mounted onto a single waterproof body, including first and second lenses having substantially parallel axes, and the first and second lenses facing respectively the rower and the rower's oar tip in opposing directions so that the field of view of the first lens in the array does not overlap with the field of view of the second lens in the array; wherein each one of the first and second lenses is associated with an image sensor and the image sensors associated with the first and second lenses are coupled to an image processor, such that the imaging device can simultaneously capture an image of the rower via the first lens and an opposing image of the rower's oar tip via the second lens when the imaging device is mounted to the rowing apparatus and the rower is rowing in the rowing apparatus; and means for receiving accurate time data for each one of the image of the rower and the opposing image of the rower's oar tip by using either: (a) a GPS satellite; or (b) a wireless transmission of time data from a single clock; such that each one of the image of the rower and the opposing image of the rower's oar tip is time stamped with accurate time data, and the accurate time data can be used as the basis for synchronisation of the image of the rower and the opposing image of the rower's oar. a mount to fix each imaging device on one of the riggers of the rowing apparatus and to align the imaging device such that each time the imaging device is mounted to the rowing apparatus, the imaging device is aligned substantially at the same angle, fixed substantially at or above a pivot point of the rower's oar for recording side elevational view images of the rower and the rower's oar, and does not move relative to the rowing apparatus during the rower's stroke; a set of at least two lenses (8, 10) mounted onto a single waterproof body, including first and second lenses having substantially parallel axes, and the first and second lenses facing respectively the rower and the rower's oar tip in opposing directions so that the field of view of the first lens in the array does not overlap with the field of view of the second lens in the array; wherein each one of the first and second lenses is associated with an image sensor and the image sensors associated with the first and second lenses are coupled to an image processor, such that the imaging device can simultaneously capture an image of the rower via the first lens and an opposing image of the rower's oar tip via the second lens when the imaging device is mounted to the rowing apparatus and the rower is rowing in the rowing apparatus; and means for receiving accurate time data for each one of the image of the rower and the opposing image of the rower's oar tip by using either: (a) a GPS satellite; or (b) a wireless transmission of time data from a (a) a GPS satellite; or (b) a wireless transmission of time data from a single clock;