Estimate running-fix error at second observation from interval, own speed, and advance-method correction - sensitivity of the fix to course/speed change.
Formula
$$ \epsilon = \sqrt{(D \sin \epsilon_C)^2 + (D \epsilon_S)^2} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $D$ | DR distance run | nm | speed × time |
| $\epsilon_C$ | Course error | deg | gyro/compass |
| $\epsilon_S$ | Speed error | % | log precision |
Sources
- Bowditch Pub.9 Ch.23.