Learn more about polar bear safety here.
The goal should be never place yourself in a scenario where you or the polar bear are in danger, but you must be ready in case one does. This requires packing a powerful enough weapon, when travelling outside of Greenlandic towns or settlements, in areas with polar bear activity. The strongest defense against polar bears is a powerful rifle (caliber 308 Win or 30-06 or more powerful). Before venturing out, learn how to handle it safely both when it’s not being used and when you’re under pressure and need to shoot to hit.