The Lancaster Sound (LS) polar bear subpopulation is one of Nunavut’s largest polar bear populations – it spans a geographical area of about 470 000 km2 (with about approximately 250 000 km2 of sea-ice) and is home to an estimated 2541± 391(mean ± 1 SE) polar bears. There are no current data for LS and the population estimate derived from data in the late 1990’s has a high degree of uncertainty, in part due to environmental changes and a prolonged male-biased harvest that has been part of the polar bear management system. In order to fulfill mandated wildlife monitoring objectives and provide appropriate management advice to the Nunavut Wildlife Management Board, we propose to undertake a 3-year study (2021-2023) involving genetic biopsy mark-recapture techniques to reassess the size and status of the LS polar bear subpopulation. In order to conduct the research, logistical preparations such as fuel purchase and caching, are required beforehand. For this 3-year field study, subpopulation size and status will be assessedby means of genetic mark-recapture, done with 1-3 helicopters, which does not require the handling of bears. Results from this study will be used to provide TAH andmanagement recommendations for the LS polar bear subpopulation. During this work,field crews will work out of remote camps (possibly Creswell Bay, Gascoyne Inlet, Polar Bear Pass camp, Fort Ross) and communities (Resolute Bay, Grise Fiord, Arctic Bay) with differing and variable time plans (from a few days to weeks out of communities and camps, weather-depending). Field work is conducted between April – June 2021, 2022, and 2023 with fuel caching activities beginning likely between August 2020 and Mar 2021.