Latitude and Longitude Tutorial Lesson Latitude and Longitude
Session IV Measuring Latitude and Longitude
description
Transcript of Session IV Measuring Latitude and Longitude
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
Rules for reading LAT/LON
On a Nautical Chart: Read the Degrees from the
LAT/LON scales. Read the Minutes from the
LAT/LON scales.Measure the Seconds 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.
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2
3
4
Step ONE – Place one point of the dividers on the
object or target.
11.0 min.
10.5 min
041 10.7’ N
The LATITUDE SCALE on a Small Scale Chart usually depicts decimal minutes.
Degrees
Minutes
Seconds or Tenths
10.0 min.
041 10’ 42” N
One Minute of
Latitude
equals
One Nautical Mile
DISTANCE
SIXTYSECONDS
OFLATITUDE
ONENAUTICAL
MILE
6 seconds1/10 of a Mile
The Second Scale on a Small Scale Chart
Measuring the Seconds of LongitudeStep ONE - Place one divider point on the object or
target..
Step TWO - Stretch the other point of the dividers back to the nearest meridian of Longitude.
Step THREE - Without disturbing the opening, move the dividers to the Longitude Scale at the top or bottom margin. 1
2
3
4Step FOUR - Read the seconds or tenths of Longitude.
The Longitude Scale
The vertical line from the Bell.
DegreesMinutesSeconds or
Tenths
071 01.4’ W or 071 01’ 24” W
END OF Session IV