INS Drift

[ultrablue2258]

I would love to see that INS Drift is implemented at some point to add realism in a no-GPS world type mission. Additionally, it would be great if this was implemented in other aircraft when they don't have a way of confirming their current position GPS, TACAN update, WP update, etc.

[Bunny Clark]

INS drift is modeled in the Mirage 2000C, which has no GPS system. Maybe it'll come to the Hornet someday, right now the GPS/INS system isn't really completely modeled at all.

[ultrablue2258]

Well GPS is somewhat modelled as in missions dated before the GPS was operational the Hornet will not align.

[Tholozor]

You can perform a Waypoint 0 or TACAN nav fix if the GPS is inop to align the INS.

[ultrablue2258]

I know how to bypass GPS alignment but what I am after is INS Gyro drift to be modelled.

[Santi871]

You can perform a Waypoint 0 or TACAN nav fix if the GPS is inop to align the INS.

 

Waypoint 0 is actually the "normal" mode we use right now in DCS when you flip it to GND. IFA would use the GPS to align, but it would take longer. ED need to fix the fact the plane never aligns if it doesn't have GPS (ie if it's not in the US coalition).

[randomTOTEN]

My understanding is that INS is still work in progress

[QuiGon]

I would love to see that INS Drift is implemented at some point to add realism in a no-GPS world type mission. Additionally, it would be great if this was implemented in other aircraft when they don't have a way of confirming their current position GPS, TACAN update, WP update, etc.

INS drift is implemented for the M2000C, Viggen and Tomcat.

 

Waypoint 0 is actually the "normal" mode we use right now in DCS when you flip it to GND. IFA would use the GPS to align, but it would take longer. ED need to fix the fact the plane never aligns if it doesn't have GPS (ie if it's not in the US coalition).

I thought the normal alignment is based on the current GPS position and hence it doesn't work without GPS being available (Hornet on red side or mission dated before 1994), which is why we then need to update our own positon through the WP0 fix update.

Edited December 9, 2019 by QuiGon

[Santi871]

I thought the normal alignment is based on the current GPS position and hence it doesn't work without GPS being available (Hornet on red side or mission dated before 1994), which is why we then need to update our own positon through the WP0 fix update.

 

Nope. It's all detailed in the natops if you want to read, but a summary is

 

A normal alignment (GND or CV) doesn't reference GPS, in the case of GND the position of wp0 is used, which can be there either from the mission card or made manually. The GPS alignment is started by moving the knob to IFA, but it takes approx 10 mins. There's also a stored heading option that should appear in the HSI DATA sublevel. CV is done either via the ship's position supplied via RF or a cable, or via manually entering all the data, similar to the tomcat.

 

Where GPS makes a difference is in that if you do have it you should move the knob to IFA after alignment is done to prevent the INS from drifting, whereas with no GPS you would move it to NAV and you'd have it drift over time.

 

To get a bit back on topic: yes, they should model INS drift at some point, but also when they model IFA to keep the GPS correcting the INS, we would be back at no drift.

Edited December 9, 2019 by Santi871

[QuiGon]

Thanks for the explanation! This makes much more sense than what I've heard from ED so far! I really hope they will make it work like that eventually!