recommendations in the coach or coxswain system that lists actions prioritized by their effect the coach or coxswain could select the instructions and the means of communication on a smartphone or tablet with in the lan one embodiment of a grading system could involve the use of a function that scores performance based on penalties for deviations from an established norm or model standard s the oar and seat waist motions recorded for a rower over a chosen series of strokes could be compared to those of an idealized motion or those of an elite rower standard with a grade assigned based on some desired bound e g u201c oar position within 1 inch of the standard 81 of the time u201d or u201c oar position within 2 u201d of standard 94 of the time u201d these grades could further be compared to some demographic or experience based norm e g u201c scores are 74th percentile for rowers in your age group and 38th percentile for rowers with 10 15 years of experience u201d of particular interest to an athlete would be how these grades evolved over time i e how one is progressing against a target learning curve one embodiment of the individualization of rowing performance could involve the simple aggregation of the estimated translational energies imparted on a boat over a set period of.