Help with Harrier JDAMs overshooting target?

[Girtholomew]

I’ve been having trouble with JDAMs in the Harrier ever since the JDAM logic changed last year. Ever since, JDAMs have always overshoot my target, regardless of what number the “Hit Likelihood” I release at. Without fail, the JDAMs travel at an overshooting trajectory causing them to take extreme maneuvers to try to hit the target, often literally going past the target and try to go backwards to hit it. Obviously these bombs are highly inaccurate and only hit around 33% of the time. Is there some additional step I am missing that has been added late last year? Here’s a general idea of the steps I take, in this case using the ripple technique.

1.) Find target with TPOD
2.) Turn on laser range function to get precise ranging information
3.) Designate target as a markpoint, using markpoint 0 as a throwaway point
4.) Repeat for above steps for subsequent targets
5.) A/G mode on, master arm on
6.) Select GBU
7.) Set fuse
8.) Designate the markpoint as target in the EHDS page. This also slaves my TPOD to the markpoint, which lets me confirm visually that I have the target, erm, targeted.
8.) Waypoint increment long, which gives me targeting information for the GBU on the hud (In this instance I have N0 under the release information circle, as I have no terminal settings applied and am in TOO mode).
9.) Wait for the ranging circle to unwind and for the “Hit Likelihood” numbers to start counting up
10.) Release weapon at some point during the count up or count down, then use WP increment to switch to subsequent targets.

It doesn’t matter what the likelihood number is, even releasing as soon as the numbers begin counting up or when it is at 100 will still result in the JDAM overshooting the target and, if I’m lucky, hit the target at a 90° impact angle. Most likely it will have overshot to the point that it can not correct itself and misses completely.

This problem is consistent when I do single target TOO, as well as preplanned targets using the F10 map and CAS targets. I have dropped well over 100 JDAMs without success and I can’t find out what I am missing from all the guides I’ve watched/read, primarily watching Grim Reapers and reading Chuck’s guide for startup procedures and weapon guides. I didn’t have this problem before JDAM logic was changed back in November or so of last year, but has never failed to be a problem since. Has anybody else had this problem and managed to fix it, and if so what am I missing? I had a lot of fun blasting 8+ targets in a single pass back then, and would really like to be able to do it again.

INB4 My plane is aligned and my GPS is turned on (as indicated by a “:” in front of the GPS on my UFC).

[ZeroReady]

have you tried setting the bomb azimuth in the weapon page? i just dropped 4 in a row using the markers on the map. they all hit precisely. i set the azimuth to roughly what i knew my approach heading would be.

[Girtholomew]

Opprinnelig skrevet av ZeroReady:

have you tried setting the bomb azimuth in the weapon page? i just dropped 4 in a row using the markers on the map. they all hit precisely. i set the azimuth to roughly what i knew my approach heading would be.

I was under the impression that if you have no terminal parameters set that it will automatically set the azimuth from the direction of the plane to the target. I will try setting the azimuth later and see if it fixes it.

[ZeroReady]

i believe that is the way it's supposed to work, but it seems to be more accurate for me if i just plug in an azimuth every time

[Orlock]

I just did a quick flight using the same sequence, 4 jdams rippled, 4 targets destroyed. I didn't set any terminal parameters and dropped from 13k. Are you targeting the vehicle or the ground beneath it?

[Zero]

Opprinnelig skrevet av Orlock:

I just did a quick flight using the same sequence, 4 jdams rippled, 4 targets destroyed. I didn't set any terminal parameters and dropped from 13k. Are you targeting the vehicle or the ground beneath it?

this, if its on the vehicle/building it might be getting the coordinates from behind it.

[Girtholomew]

Opprinnelig skrevet av Orlock:

I just did a quick flight using the same sequence, 4 jdams rippled, 4 targets destroyed. I didn't set any terminal parameters and dropped from 13k. Are you targeting the vehicle or the ground beneath it?

I target the treads of the vehicles, as per the tutorials I watched, and launch at around 15k give or take. And even if I did incorrectly designate my target, it wouldn’t cause a JDAM trajectory that flies past the designated point then attempt to fly backwards to try and correct itself, resulting in the ~90° impact I mentioned. And I do mean literally flying past their targets and “turning around” in an attempt to compensate. Happens for single and ripple TOO as well as PP, every time without fail, regardless of the hit likelihood number.