pilot chart

American  

noun

1. any of a number of charts issued to mariners by the U.S. Hydrographic Office and showing meteorological, hydrographic, and navigational conditions prevailing, or likely to prevail, subsequent to the date of issue in some part of the world: issued monthly for most areas.

2. a chart giving information on atmospheric conditions at various altitudes.

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Example Sentences

I am as one tempest driven, without pilot, chart, or compass.

From The Story of My Life Being Reminiscences of Sixty Years' Public Service in Canada by Hodgins, J. George (John George)