Method for UTM conversions from Lat/Long



Method for UTM conversions from Lat/Long

1. Establish your UTM zone.

2. Locate the Central Meridian of this UTM zone.

3. Determine the degrees of difference between your position and the Central Meridian.

4. Multiply the degrees by the meter conversion. This may include an angle adjustment if not located on the equator.

5. Add, or subtract, this from the 500,000 coordinate of the Central Meridian. This answer cannot be less than 200,000, or greater than 800,000. If so, you are in the wrong UTM Zone!

6. For the Northing, convert the degrees into meters using the multiplier of 100,000 meters per degree.

7. Present the answer in the form: Zone A, X, Y where X is the Easting coordinate and Y is the Northing coordinate, both measured in meters.

Method for determining Lat/Long position from sextant and chronometer observations.

1. For Latitude. Establish the latitude where the sun is directly overhead at the date in question.

2. Compute the difference between the directly overhead position and the actual observed solar inclination, in degrees.

3. Add, and subtract, this number from the latitude in part (1). You will have two answers.

4. If either answer is greater than 90 degrees, either North, or South, then the coordinate has no physical location and does not exist on the surface of the Earth.

5. Provide the correct answer

6. For Longitude. Compute the number of hours difference between the Greenwich time and the time of local noon as given by the chronometer.

7. Multiply this by 15 degrees and add to zero. Ensure that you are in the correct hemisphere.

All coordinates must be specified precisely! Failure to indicate West, East, North or South will be subject to a grade deduction.

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