I was wondering:

As you may know, there are some alerts that appear on the HUD. You've may seen the Radiation Alert and the Missile Locked Alert. However, at some points (the ones I can remember are in the 1st mission, and the fight before going into the dyson shpere's system) I get another alert, the Trail Alert. What the heck that means?

I'd like, also, to aks if there's a way to add another alert like that to Sensor Efficiency Reduced Alert. Like a blue sign with a radar dish on it...

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Sorry for any inconvenience...