Author: Benjamin Brooking
If you've spent any time looking into directional measurement instruments, and particularly gyros then you'll know that there are two main types of gyro tool: Integrating (or surface-referenced) and north-seeking.
If you've not read too far into it then the key fact to take away is that integrating gyros accumulate errors over time; the longer you run them the less accurate they are. These are commonly used for surveying because here they can be run very quickly and over that time maintain high accuracy.
North-Seeking gyros on the other hand measure the spin of the earth itself to get an absolute measurement at each survey point, regardless of the time since . . .
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