Flag

If you are using Galaticraft mod or any likely mod, this one will be perfect for you :] You can costumize it using any banner pattern you want.

The crafting recipe is simple, just 3 sticks and a banner pattern

Function
If you are navigating with a map, the flag will appear in the map with a symbol of your banner pattern.

If you are a using a mod that includes the moon of being exploreable, if you place a flag in the moon, you will see a nametag saying (Your Flag) located in the moon.