The TW2002 Docs
Density Readings: 0 = Empty Sector or Ferrengi Dreadanought 1 = Marker Beacon 2 = Limpet Type 2 Tracking Mine 5 = Fighter (per Fighter) 10 = Armid Type 1 Mine 21 = Navigation Hazard (Per 1 Percent) 21 = Destroyed Ship (Due to 1 Percent Nav-Haz) 38 = Unmanned Ship 40 = Manned Ship, Alien or Ferrengi Assault Trader 50 = Destroyed Starport (After 25 Percent Nav-Haz Clears) 100 = Starport or Ferrengi Battle Cruiser 210 = Destroyed Planet (Due to 10 Percent Nav-Haz) 462 = Federation Starship under Admiral Nelson 489 = Federation Starship under Captain Zyrain 500 = Planet 512 = Federation Starship under Admiral Clausewitz 575 = Destroyed Port (Before 25% Nav-Haz Clears)
The TW2002 Docs