Flag State

What does the blue field on the Maine state flag represent?
I’ve done a bit of a google search and advance search but I’m having the darnedest time getting answer. I’ve read its the blue of the US flag, but that’s it. I even tried to look up the significance of the blue on the US flag as back up.
I’m assuming it has to do the Maine’s connection to the sea.
Anybody know better?
Maine’s official state flag was adopted in 1909. The flag has a blue field with the state coat of arms in the centre.
The arms shows a shield between a farmer and a seaman with a pine tree, a moose, grass, sky, and blue water. The yellow star represents the North Star, as Maine was the northernmost state when it entered the Union. The red ribbon reads, “DIRIGO” Latin for “I direct”.The blue ribbon simply reads “MAINE”
Maine was the 23rd state of the US, joining the Union in 1820
Raise the Flag IV: Glory To The State