Battle of Tau Ceti is a team-based multiplayer space combat game. Pilot ships from small one-man fighters to a huge six player battleship or hop into a turret to shoot down enemy ships. Capture sectors to gain resources for your team, use resources to buy better ships and ultimately destroy the enemy flagship.
So the blue grid is more of a battle space boundary, like a map edge?
That is correct, the grid shows the boundary of each sector.