Artillery question

[Montana Grizz]

I asked once how one determined if an artillery piece could fire on a hex without having direct or indirect (via a spotter) visibility.

I am almost certain that I was told that if one highlighted the unit and then looked at it's picture and if that picture showed a small artillery piece in the lower left-hand corner, it ment it could fire on any hex within it's range with or without visibility?

Have I once again screwed up in the memory department?

Thank you for your assistance,

Pat