Thought it would be nice to post it again as there are a number of new players around.
This list has been posted before quite some time ago but I don't know who did it but all credit to you.
Coordinates in sector is how the show up on you bottom right in the sector map top to bottom. 0,0,0 is center of map, 0,10,0 is 10km above center (over your head) 10,0,0 is 10km north of center, -10,0,-10 is 10km South and 10km West. You'll figure it out.
The ships
Toucan Hauler in sector Menelaus Frontier ( 0,3 ) at 43, -7, 35
Iguana Vanguard in sector Family Whi ( 0,6 ) at 0, 0, 40
Harrier Sentinel in sector The Vault ( 0,13 ) at -25, -10, -14
Falcon Sentinel in sector Unknown Sector ( 0,16 ) at -20 ,3 ,2
Buzzard Hauler in sector Family Tkr ( 3,14 ) at -35, -7, -10
Buster Sentinel in sector Akeela's Beacon ( 6,8 ) at 30, -10, -30
Buster Sentinel in sector Treasure Chest ( 6, 14 ) at 0, 50, 0
Scorpion Raider in sector Xenon Sector 101 ( 7,5 ) at 0, 0, 80
Mamba Raider in sector LooManckStrat's Legacy ( 10,9 ) at -17, 0, 0
Nova in sector Unknown Sector ( 10,18 ) at -12, 1, -19
Mako Raider in sector Depths Of Silence ( 13,0 ) at 1, -3, 38
Pericles Vanguard in sector Unknown Sector ( 15,7 ) at -10, 10, 10
There is also the racing ship Starburst in sector Freedoms Reach ( 7,4 ) and the ship is straight above the North gate, about 35km. Just turn your ship straight up when you come through the gate and you should soon see it on your sector map. Not sure if this one show up before you have done the racing mission in the plot.