Reposaku is a web app visualizing high-precision vehicle trajectories to pass down veteran agricultural skills. To enable future automation and solve labor shortages, capturing farmers' "implicit knowledge" is vital. We seamlessly integrated an ultra-precise, "zero-operation" GPS logger with a 12cm error margin. Simply plugging it in instantly visualizes grueling daily labor as "beautiful trajectories" on a game-like map, boosting efficiency by 18% and protecting elderly farmers' dignity.