We are scientists with the German Alfred Wegener Institute for Polar Research and have carried out airborne sea ice observations in Nunavut for many years.Here we propose to continue our long-term observations and to include Cambridge Bay and Victoria Strait as a new study region. This complements our other study region where we have worked for many years, including Resolute Bay, Pond Inlet, Eureka, and Alert. We use a DC3 airplane for our sea ice observations. It will carry cameras, a radar, and an EM prove for measuring snow and ice properties. The airplane will take off and land at open airports in communities in Nunavut. It will fly along long, straight transects 200 or 300 miles long. It will fly low over the sea ice at 200 ft altitude. On board the aircraft will be three crew and three scientists. They will overnight in the communities. Two or three flights will be carried out from each community.The objective of the surveys is to observe the variability and change of sea ice and snow thickness and deformation in the Canadian Arctic. Results are important for better understanding of climate change. They will also be used to improve satellite observations of ice conditions, for example for better generation of ice travel hazard maps, and to evaluate the feasibility of shipping in the Northwest Passage.In the past we have been granted permission to survey the sea ice in the vicinity of Resolute Bay, Pond Inlet, Eureka, and Alert. Here we ask for permission to survey the sea ice around Cambridge Bay, including in Dease Strait and Victoria Strait. We will avoid surveying in protected areas.Our surveys are planned between March 25 and April 13, 2025. We plan to repeat them every year for the next five years during the March and April time period.