Past catastrophic events as consequences of human navigational errors shows fail of the assessment methods adopted by maritime education and training institutes. Navigation simulators are an exceptional means of training in which the trained person performs tasks similar to those that are exposed in reality. However, the International Maritime Organization does not establish specific methodology with respect to training and assessment through the use of multi-task with simulators. The aim to apply to the simulation an adapted evaluation model that allows estimating a student's performanceevaluation based on their workload and level of stress. Practical assessments of mariner skills are executed in the controlled environment than the simulators provide. A feasible scenario is set up using a ship-handling simulator and an experiment is conducted, participants were maritime navigators and students. The results conclude the validity of the adapted assessment model to obtain the performance. Linear regression analyses indicated a direct relationship between the variables workload, stress level and situations to be controlled and positive self-reported learning effects of mariner competency.