Thanks for your reply.

1-You are right I did not entered correctly: :o
Here is the coordinates:

N25.47.09 W80.16.73

Correct entry should be:

N25479   W080167

2- During the long flight with correct coordinate entry, INS  lost signals and alignment from 0.4  went to back 9.5.

3- Here is the interesting 707 good joke on me. INS lost direction, but 707 did not.
Continue to follow flight plan next 1950 nm with out any error.

4-IF 707  internal nav system can followup the FP independently, why I am keep spending 30-45 minutes at Airport to prepare the INS navigation system? >:(

5- New 707 Extension, Will Captain Sim  remove on-realistic  Flight Plan followup and put real INS navigation system into 707 ?  :)

6- Over ocean, how can I lower 9.5 to 0.5. There is no DME/VOR available? :-?

THX :)