War, disease, and hunger wiped out in the two decades prior to ENT. Transporters have a range of 2,000 kilometers... or perhaps 10,000 kilometers.
Gravity boots are available.
Hand tricorders may scan for Xindi on 21st century Earth to a 3 kilometer radius.
MACOs have subdermal communicators.... and may very typically peg 9 targets on the range in 10 seconds on Level 4 of their target simulation program.