red flag in TAG 'no el'

I was following Grim Reapers tut on waypoints

A-10C Warthog: Creating & Navigating Waypoints

and although I could create mark points, make waypoints etc.

A red label appearred in the TAD with the letters 'no el'

I think it means I did something wrong but dont know what. I switched off the CDU and EGI and turned them back on again but have the same issue as soon as I try to convert a mark point to a way point with TMS short right. Yes I waited until the CDU was fully booted up ( 4008)

ANd I cannot set the EGI button

I’m assuming thats an abbreviation for “no elevation”. Did you do “load all” on the mfcd during startup? If you are missing the elevation database that could cause trouble.

I did load all. I discovered the problem

I started setting waypoints in the TAD without doing two things:

1) clicking the NAV button in the CDU

2) clicking the EGI button on the front panel

To reset it, I have to turn off the CDU and then turn it on again.

Then re-align the CDU, and then make sure to hit Nav and EGI

Great. The NAV button on the cdu is just a menu page selection, so fee free to use other modes on the cdu (offset, flight plan, etc). That was unlikely the key.

Now the EGI on the other hand is very important. The default source of position info is the legacy HARS (Heading, attitude reference system... notice no “altitude”). EGI is a blend of GPS and INS, and both can provide accurate elevation.

The option to not use EGI is an emergency option that TBH I have never used at all.

Standard startup, once the cdu says ins is aligned, select EGI on the NMSP and you won’t need to reset anything.

A good checklist is highly recommended for startups.

Cheers, enjoy the A-10!