F-14: INS degradation and.. lag!

That the INS degrades is a well known fact. Heatblur introduced it almost one year ago in their post called “All About Inertia“. I soon realized that re-aligning the INS while the ground crew rearms and refuels the aircraft is very important to ensure proper navigation and both AA and AG efficiency. Whilst-R&R complete re-alignment, plus a occasional TACAN fix, solve most issues. Usually.. Yesterday we were conducting some AG tests but my pilot had massive lag spikes due to his streaming acting weirdly.
This is a screenshot from TacView:

rio7-INS-tacview-lag
Lag you say?!

What I did not expect is that the movement induced by the latency somehow affects the INS! I still do not understand why since only the RIO was rubber-banding (myself) and not the pilot. Nevertheless, I created the HB WP right over AF and after this short, laggy, flight, here it is way out of position and way above the normal tolerances.

rio7-INS-degraded-homebase
Note the WP off to the left despite being over flying the runway.

The initial INS was pre-aligned. This fact induces a certain degree of intrinsic imprecision but I have never seen such a distortion in the INS after a short flight with absolutely no manoeuvre inducing G>3.

Fixing the INS

There are a number of ways to correct the INS error and they are described in the manual.
I personally recommend the TACAN fix and the Visual in case you have a clear reference point and its precise coordinates (I had acceptable results by using airfields).
I plan to write a more in-depth article about this topic later on.

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