[NO BUG] VIS FIX updated on TID but not on LANTIRN

[diditopgun]

Hi !

 

Today I (RIO/hoster) did some test with a friend (Pilot/client) about LANTIRN's coordinates display to know if its link to the Tomcat INS or pod's GPS receiver; and VIS FIX INS update.

 

Firstable, It seems coordinates displayed on LANTIRN don't suffer from INS drift, so can you confirm that LANTIRN pod is hybridized by GPS ?

 

Then we noticed that typing new coordinates in waypoint1, update waypoint1 position on TID and LANTIRN QWp1 too as intended.

But ! If we update waypoint1 position by a VIS FIX; it updates waypoint1 position on TID but not LANTIRN QWp1.

Edited August 12, 2019 by IronMike

[Super Grover]

Hey!

 

LANTIRN has its own INS, and it uses GPS data to align/correct the INS.

Also, it can read waypoint coordinates from AWG-9.

 

However, I think that the way you use VIS FIX may be wrong. With CAP drum set to NAV category, the VIS FIX button is used to apply a shift to own INS position based on a position of a waypoint you can easily identify visually. You have to press it when overflying that waypoint.

It means that the FIX procedure doesn't change the coordinates of the waypoint, but only updates the INS. That's why you observed no change of the QWP1 on the LANTIRN screen.

 

The only way to update a waypoint position is to enter new coordinates manually or drag it with the HCU.

[QuiGon]

The only way to update a waypoint position is to enter new coordinates manually or drag it with the HCU.

Or use the SURFACE TARGET waypoint instead, becuase when doing a nav fix on it, it does not update the INS, but moves the waypoint to new coordinates ;)

[diditopgun]

Aaaah yes.... It doesn't change coordinates, it's only a shift to my own position! That make sense, thank you Super Grover!