The INSROP Simulation Study has developed a model for numerical simulation of the time and costs involved in using the Northern Sea Route, and has calculated the time and costs for a several scenarios using different ship types, different routes and different times of year. The results are summed up in INSROP Working Paper 164–1999: ‘The NSR Simulation Study Work Package 8: Simulation of NSR Shipping based on Year-round and Seasonal Operation Scenarios’ by K. Kamesaki, S. Kishi & Y. Yamauchi.This final report is based on detailed studies published in INSROP Working Papers 107, 108, 120, 121, 128, 139 and 155.