We first made this foldable and worked out the examples together.
Polar Coordinates Foldable
I then had them try figuring out a few coordinates in this Geogebra Activity.
Once they felt comfortable enough, I turned them loose to play Polar Coordinate Battleship with a partner. I was shocked at the number of kids who had never played or even seen the board game battleship before, so we had to take a few minutes to explain the basics, but then they were off. Calling out the coordinates was a slow go at first, but those who stuck with it quickly got much better at it.
Polar Coordinates Battleship