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Odd Field "dip" in gps_common::GPSFix message type

asked 2012-10-18 14:47:53 -0500

Bryce Hathaway gravatar image

I've been assessing whether this message type is appropriate for use with my Novatel GPS + IMU system, but raised an eyebrow when "dip" followed "pitch" and "roll". Where's yaw? Is this just a typo?

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answered 2012-10-18 16:05:59 -0500

Ryan gravatar image

I'm not 100% sure, but I believe dip refers to this:

For yaw, I think you're looking for "track"

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answered 2020-09-24 07:24:50 -0500

tdome gravatar image

It appears that "track" substitutes yaw, or heading, hence it would be more intuitive if that quantity were moved to the section "# Device orientation (units in degrees)". I believe what is meant here is not the dip angle as used by geologists - which would just be the complementary (depending on the definitions) angle of pitch - but the local magnetic inclination, i.e. the angle of the Earth's magnetic field lines relative to the horizontal, again see here. This could be reinforced by looking at this explanation.

Most GNSS receivers do not have a "dip circle" which would measure this quantity. Nevertheless, this angle is frequently used in aviation since it might cause the airplane's compass to give erroneous readings.

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Asked: 2012-10-18 14:47:53 -0500

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Last updated: Sep 24 '20