Refer to figure.
Actual Position: 139º46,3'E
However, a different position is inserted in the IRS: 139º46,3'W
The aircraft will fly towards 180ºE/W, which equals a Longitude Change = 180º - 139º46,3º = 40º13'42''
- The IRS position will experience the same longitude change, but from the initial position entered in the IRS:
Therefore, the new IRS position is: 139º46,3'W - 40º13'40'' = 99º32'40''W
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