Grid To Magnetic Azimuth
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Grid To Magnetic Azimuth
Longitude/latitude and reference object reading are some 4' off. The magnetic grid has the most variation. Convert from magnetic azimuth to grid azimuth.
The phrase 'mag to grid, get rid & grid to mag, add' is a simple mnemonic to help you remember how to make the correct adjustment after either taking a bearing using a magnetic compass or taking a grid bearing from a map. Knowing the grid reference of a survey azimuth is key to understanding the correct handling of the downhole survey data. Convert from magnetic azimuth to grid azimuth.
To convert a grid azimuth to a magnetic azimuth, subtract the gm angle.
Move to a second known position 7. As per the map diagram, to convert a magnetic azimuth to a grid azimuth, you substract the gm angle. This is a direct result of the grid north lines being parallel with each other. If you plot your grid azimuth on a map and it reads (for example), 180 degrees (gaz), and you know your local declination is 15 degrees east, and you wish to convert your gaz to a maz, simply subtract the declination of 15 degrees and you’ll have a 165 maz, or ‘magnetic’ azimuth that you can use with your compass.
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