Should you be vacationing next summer at the Cape Cod National Seashore, don't plan on relaxing at Nauset Beach: You'll be pestered constantly on 50 MHz for your rare FN51 exchange. If you live in the farthest northwest reaches of Washington state, your CN78 designator will make you very popular on the VHF bands. If you live in Virginia Beach, Virginia, you are on exclusive FM26 real estate the rest lies under the Atlantic Ocean.
And determining your locator is a piece of cake! It's all about collecting grid locators, the new VHF cousin of DXCC.