| FIND: | |||||||
| Error | True * | Compass * | Error | ||||
| True to Compass * | True * | Error | Compass * | ||||
| Compass to True * | Compass * | Error | True * | ||||
| Error by Var and Dev | Variation | Deviation | Error | ||||
| Dev by Err and Var | Error | Variation | Deviation |
* TRUE and COMPASS means COURSE or BEARING