The distance at which you can be targeted, and show up on the radar, is a function of your proximity to asteroids. Probably a 1:1 ratio, capping at 500m, and 5000m.

So... people can hide in asteroid fields.

I'd say this should be allowed only within 15m from an asteroid, and on the opposite side from the player scanning... If they're on the face of an asteroid, the background of the asteroid should be enough to give them away anyway...

I'd say my way lags less, or whatever. I'd say your way is more fun.

A motion detector might do the trick as well. What if the radar lagged a bit when trying to identify a new contact? Wouldn't this provide a nice add-on opportunity? MOTION SENSOR, 400m... farther the more expensive...