621-mile [1000 km] range
Quit inventing nonexistent precision when doing unit conversions. If the original source quotes 1000 km, which is obviously already an estimate (being a round number) and has only 1 sig fig, “600-ish” miles is all the imperial unit precision you get.
Excuse me? I don’t do imperial, I am from continental Europe. :)
It was aimed at the article writer, not you, although I see now that the actual headline was only in imperial and you added the metric conversion, so I understand why it may have seemed otherwise. You actually converted it back with an appropriate amount of precision, so that’s good.
Since we’re picking nits, I hate that the image at the top is a completely unrelated drone. The caption does not tell you that the image is of a generic short range drone. Then the image at the bottom that could be the test article has no caption at all to tell us what it is.