It's my one great annoyance with Armada. Why do we have three different forms of measurement? Range, Speed, and Distance. Why not just use centimeters?
To make it harder to estimate with precision more than one measurement at a time with only one ruler. If Distance 1 is X cm, I'll always know if my fighter can engage an enemy (except for Speed 5 squadrons) because I can measure the Y cm movement distance, and plainly see the remaining X cm.
Similarly, if each movement tick distance was Z cm, I could use the range ruler to estimate the distance I can travel (and the range bands from that point) with much higher accuracy.
By making every unit of measure a slightly different standard they reward people with excellent visual awarenesses.
Yeah, far from an annoyance, this is something that actually really impresses me about the game: the depth that is generated by the irregularity between and within the sizes of the three measurement scales. They are very precisely implemented and add a lot to the fog of war in executing your battle plan.