Session IV Measuring Latitude and Longitude
10
Session IV Measuring Latitude and
description
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: - PowerPoint PPT Presentation
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.
1
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
