User blog comment:B1llyj1m3/If I Owned Combat Arms... (revised)/@comment-147.26.87.13-20110801144220/@comment-1906486-20110801235746

HBD/HBS are completely separate devices, one is a self-used portable device. The other is a bit more bulky, but it provides your full team with intel. It's basically a GP Sat Scan, which can be turned on and off as you need it. Instead of just the Sat Scan's full outline/few second visibility to everyone.

Sat Scan gives an idea of someone's direction of view and much more, but it's pretty costly for time vs the HBS/HBD in terms of recharge.