"There are a few indications, I like to look in the bottom left data block in the HUD. You should see STPT, TGP, TAD respectively, letting you know what is currently designating your SPI."
I am always able to create a SPI with HUD, how do you make it say TAD? Should the TAD be SOI or should the HUD be SOI when try to hook TAD red triangle? I've tried TMS down long to clear but I still can not hook it.