Endorsements
Endorsements are available to recognize those operators who have confirmed contacts with additional grid locators beyond the minimum required. These endorsements are available in increments of 25 grids for the 50 MHz and 144 MHz bands, 10 grids for the 222 and 432 MHz bands, and 5 grids for 902 MHz and higher bands.
Read more about this topic: VHF/UHF Century Club