sea mile

/'si:mail/

Thân thiện

A sailor measures a distance of one sea mile on a nautical chart.

Definition

1. Noun:
   • A nautical unit of distance: A "sea mile" is a unit of length historically used for maritime and aerial navigation. It is based on one minute of latitude along a meridian, making it a measure of distance on the Earth's surface.
   • A specific historical measurement: In particular, it refers to a former British unit, equivalent to 6,000 feet (approximately 1828.8 meters).

Usage

• The term "sea mile" is used in historical or technical contexts to discuss navigation, maritime charts, or older measurement systems.
• It is crucial to distinguish it from other similar units like the "nautical mile" or the "statute mile," as their exact lengths can differ.

Examples

• Noun:
  • The old chart indicated the distance between the two ports as twenty sea miles.
  • Before international standardization, a British sea mile was defined as 6,000 feet.

Advanced Usage

• "sea mile" vs. "nautical mile": While often used interchangeably in casual contexts, "sea mile" can specifically refer to historical national definitions. The modern international standard is the "nautical mile," which is exactly 1,852 meters.
  • The international nautical mile has largely replaced older units like the sea mile.

Variants and Related Words

• Nautical mile (n): The modern, internationally accepted unit for air and sea navigation, equal to 1,852 meters.
  • The ship traveled at a speed of 15 nautical miles per hour.
• Statute mile (n): A unit of distance on land, equal to 5,280 feet (approximately 1,609 meters).
  • The town is 10 statute miles inland.

Synonyms

• Nautical mile: The closest modern equivalent, though not always historically identical.
• Geographical mile: Another historical term based on one minute of latitude.

Học thuật

Noun

1. a former British unit of length once used in navigation; equivalent to 6,000 feet (1828.8 meters)

Từ đồng nghĩa

• mile