• WordNet 3.6
    • adj chartless (of unknown regions) not yet surveyed or investigated "uncharted seas"
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Webster's Revised Unabridged Dictionary
    • Chartless Not mapped; uncharted; vague.
    • Chartless Without a chart; having no guide.
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Century Dictionary and Cyclopedia
    • chartless Not charted, or not provided with a chart; hence, without a guide or guidance: as, a chartless rover.
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In literature:

They were as chartless as Columbus was in 1492.
"The History of the Telephone" by Herbert N. Casson
Its hundreds of thousands of square miles were as dark and chartless as Darkest Africa.
"Revolution and Other Essays" by Jack London
But how about those deeper-draft, chartless sailing craft?
"Virginia: The Old Dominion" by Frank W. Hutchins and Cortelle Hutchins
His imagination pictured Cyrus and Belinda starting as light-hearted adventurers to sail the chartless seas of romance.
"Virginia" by Ellen Glasgow
Too much of college teaching is a blind groping, chartless and without compass.
"College Teaching" by Paul Klapper
What strange shore or chartless sea Holds the awful mystery?
"The Atlantic Monthly, Volume 15, No. 91, May, 1865" by Various
In all the chartless future, freedom was the one thing for which she longed.
"Eden" by Edgar Saltus
And in this fashion they sat and mapped the chartless future.
"The Truth About Tristrem Varick" by Edgar Saltus

In poetry:

Where be now these silent hosts?
Where the camping-ground of ghosts?
Where the spectral conscripts led
To the white tents of the dead?
What strange shore or chartless sea
Holds the awful mystery?
"The Grave" by John Greenleaf Whittier