[REPORTED EARLIER] Designating ground target with HMD

[LooseSeal]

I just know this is going to be a really dumb question and I'm not doing something right! But when I'm in the reticle mode for the HMD and I use TDC depress on the ground it keeps designating a point in mid-air... which is obviously not very helpful when tried to get the TGP to look in that direction. This only seems to happen sometimes... particularly after a cold start, which is why I think it's me!

 

Anyone can tell me what I'm doing wrong?

 

Edit - Due to what I'm reading here, on page 14 - https://trace.tennessee.edu/cgi/viewcontent.cgi?article=3359&context=utk_gradthes Is this just an accurate recreation of the JHMCS's error in calculating BAAT?

 

Funnily enough, lowering my altitude and placing the nose in the direction of where I wanted to designate seemed to help. Guess I've answered my own question, but hopefully it helps anyone with a similar problem.

[bart]

I've not had this happen so first thing that springs to mind as you say it mainly happens after a cold and dark start is your INS alignment procedure.

 

Sorry if I'm telling you to suck eggs here, no offence meant, but I'll try and explain the INS bit just in case this is a cause of your issue.

 

Once you get one engine running turn the NAV switch on the right console to GND if at an airfield or CV if on the boat, I'll assume you're at an airfield, so turn it to GND.

This will take approx 8 mins to align, but you can click on STD HDG button on the bottom row of the lower centre display, second button from the left, and this will do a quick align taking about 2 mins to complete.

Once you see OK on the lower MFD HSI page the alignment is complete then put the NAV switch to IFA.

 

Otherwise, not sure as I haven't come across this issue myself, if I have the HMD as SOI, the TGP switched on and on the right MFD and if I then press the TDC designate, it creates a TGT point on the ground at that point and the TGP slews to it straight away.

 

Let me know if any of this helps....

Edited December 21, 2020 by bart

[Tholozor]

Problems with JHMCS TGT designation is a known issue: 

 

[NineLine]

This has already been reported, thanks!