Session IV Measuring Latitude and Longitude

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# Session IV Measuring Latitude and Longitude - PowerPoint PPT Presentation

Session IV Measuring Latitude and Longitude. General Rules. On a chart, LAT/LON is read in: Degrees Minutes Seconds or Tenth’s of a Minute. Set your GPS to read DEGREES – MINTUES - SECONDS. LAT/LON Expressions. On a Nautical Chart:

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Presentation Transcript

Session IV

Measuring

Latitude and Longitude

General Rules
• On a chart, LAT/LON is read in:
• Degrees
• Minutes
• Seconds or Tenth’s of a Minute

DEGREES – MINTUES - SECONDS

LAT/LON Expressions

On a Nautical Chart:

• 042 deg 56 min45 sec North
• 072 deg 45 min25 sec West

Typical GPS or LORAN read out:

• 042 56.750 N
• 072 45.417 W

On a Nautical Chart:

• Read theDegreesfrom the LAT/LON scales.
• Read theMinutesfrom the LAT/LON scales.
• Measure theSeconds or Tenth’s of a Minute.
Measuring the Seconds of Latitude.

Step TWO- Stretch the other point of the dividers to nearest Parallel of Latitude.

Step THREE - Without disturbing the opening, move the dividers to the Latitude scale in the left or right margins.

Step FOUR- Read the seconds or tenths of latitude.

041 10.7’ N

11.0 min.

10.5 min

DISTANCE

One Minute of

Latitude

equals

One Nautical Mile

DISTANCE

Sixty Seconds of

Latitude

equals

One Nautical Mile

6 seconds

1/10 of a Mile

SIXTY

SECONDS

OF

LATITUDE

ONE

NAUTICAL

MILE

Measuring the Seconds of Longitude

Step TWO- Stretch the other point of the dividers back to the nearest meridian of Longitude.

Step ONE- Place one divider point on the object or target..

Step THREE- Without disturbing the opening, move the dividers to the Longitude Scale at the top or bottom margin.

END OF

Session IV