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The CoO$_{2}$ layers in sodium-cobaltates Na$_{x}$CoO$_{2}$ may be viewed asa spin $S=1/2$ triangular-lattice doped with charge carriers. The underlyingphysics of the cobaltates is very similar to that of the high $T_{c}$ cuprates.We will present unequivocal $^{59}$Co NMR evidence that below $T_{CO}\sim51 K$,the insulating ground state of the itinerant antiferromagnetNa$_{0.5}$CoO$_{2}$ ($T_{N}\sim 86 K$) is induced by charge ordering.

^{59}Co NMR evidence for charge ordering below T_{CO}\sim 51 K in Na_{0.5}CoO_2