Why did the pilgrims bring a jack on board the mayflower?

The pilgrims brought a jack, or a flag, on board the Mayflower to symbolize their mission and identity as they embarked on their journey to the New World. The flag served as a representation of their religious beliefs and aspirations for establishing a new life based on their values. Additionally, it was a way to assert their presence and intentions in unfamiliar waters, potentially aiding in communication with other ships or settlements they might encounter.