Detect and Ranged Attacks

[Engurrand]

I keep running into a confusion about how Detect and its derivate powers (seeker sense, telescan, psidar, etc) interact with ranged attacks.

Is a Psi with Telescan subject to darkness or light cover penalties for an attack against a target they can see and have recently telescaned?

By my reading of the rules, if Detect is not modified with Reflexive (and in the case of Telescan it is not), then you can only "ping" like a sonar, once per activation, to find the direction to your target. It would follow that once you've pinged somebody, you would not be able to target them, as you would have no guarantee that they remained stationary in the second since you pinged them. The best you could do would be to shoot into the hex that you pinged, hoping they hadn't moved. So, you could target that hex without light cover or darkness penalties, but not that person.

If you want to be able to "lock on" to a target with Telescan so that it continues to reveal the direction they're in after your ping, you need Reflexive. If you have Reflexive, then you ping all the time automatically and can target without darkness penalties, or even while blind, as long as you're fighting enemies you can detect.

Have I understood this correctly?