Achievement badges are used by many chapters, but are not required to participate or advance.  Many chapters use badges as a focus for meetings or gatherings and many kids like the concrete accomplishment and reward badges provide.  Navigator badges are divided into the four Compass Points designated by the color of the perimeter stitching (Mind/blue, Body/red, Planet/green, Freedom/white).  Each badge has each of the three advancement levels with increasing difficulty required with progression designated by the color of the badge background (Stargazer/light green, Junior/dark green, Senior/blue) There are also mastery badges and badges for safety skills such as knife skills, bravery, etc.