What is "chartless"

Usage examples of "chartless".

It was a world of ceralean blues, deep-velvet purples, inked greens, of wide brainstone coral cliffs and deep-bottomed troughs where the sea turned black in the chartless depths--a world of eel and octopus and squid, of the soldier crab and the loggerhead turtle, of jeweled angelfish, gliding manta rays, and great blue marlin.

The stars burned with a lidless fixity and they drew nearer in the night until toward dawn he was stum­bling among the whinstones of the uttermost ridge to heaven, a barren range of rock so enfolded in that gaudy house that stars lay awash at his feet and migratory spalls of burning mat­ter crossed constantly about him on their chartless reckonings.