Okay, so I know Contact Coordinates give me a battle with a Rare NPC

- but I assume that it is a rare that is appropriate to my current level/rank

In that case, to get a chance to get the really good rares, I am assuming that some of the better rares are not available until you reach a certain level/rank.

If this is true - what is the lowest rank that you would wait until before you used your Contact Coordinates?

I would save those until at least 250. there are some good npcs that you can fight at that rank.

i used mine when i got em. i was low enough to where i got a crimson armory. lower ranks definitly have the advantage when using em cause it allows em more chances to get terraformers and fluxes.