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- Q162 - Navigation General: Near Coastal
150. The needle of an aneroid barometer points to 30.05 on the dial. What does this indicate?
Aneroid barometers used on U.S. vessels are typically calibrated in inches of mercury; therefore, a reading of 30.05 indicates 30.05 inches of mercury. This value represents the current pressure and does not inherently signify a rising or falling trend.
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