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Magnetic dip,Magentic declination

what are the reasons for it apart from local attraction.pls enumerate friends.
1 prelims,2 mains - CSM and IFS
Psychology .
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Comments

  • is local attraction included in all these or its simply computed separately in surveying?
    1 prelims,2 mains - CSM and IFS
    Psychology .
    ·
  • Both Dip and declination don't depend on local attraction.
    if u hold a compass in a vertical plane it will show some angle with the horizon, that is dip.
    Declination is just the difference in angle between true north and geographic north. ( true north is somewhere in Canada and geographic north is north pole.)
    Both dip and declination varies from one place to another.
    Local attraction is caused when a magnetic compass is affected by nearby magnetic field like iron shades, transmission towers etc. Local attraction is different for different points in a field plot and yes they are needed to be calculated and adjusted to true readings.

    But I am curious, does ur optional psychology includes surveying topics?
    "The fault, dear Brutus, is not in our stars, But in ourselves, that we are underlings."
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  • thanks for ur explanation bro.

    forestry includes surveying :) .
    1 prelims,2 mains - CSM and IFS
    Psychology .
    ·
  • ok. :smile:
    "The fault, dear Brutus, is not in our stars, But in ourselves, that we are underlings."
    ·
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