• A dashed line indicates an exit it knows exists, but doesn't know where it leads. In other words, follow the dashed lines, that make them become continuous lines, which indicates it knows where that exit goes.
  
  
• You can RH-click on any room to speedwalk to that room.
  
  
• A purple connecting line indicates an up/down connection. A cyan line indicates an in/out connection.
  
  
• You can type "map zoom in" or "map zoom out" to zoom the map in or out (which makes the room boxes larger or smaller). I have those set up as a macro (F2 and F3) to make zooming fast and easy.
  
  
• You can type "map find <place>" to search the room names for matching words, eg.
  
  

  
  > map find path
  
  Path north of the fire pit (road) - 1 room away
  Tree-lined path (road) - 2 rooms away
  There were 3 room(s) found which I cannot find the path to within 50 rooms from here.
  

  
  
  Click on any of the listed hyperlinks to speedwalk to that room. Speedwalking takes the shortest known path.
  
  
• You can hover the mouse over any room on the map and an information box will pop up giving the room name, exits, room number and area.
  
  At present the area will be "Area 0" - in the preloaded database the areas will be known.
  
  
• The mapper always draws the current room first, and then the rooms connected to the first room's exits, and then repeats for each of those rooms. The net effect is that sometimes the map appearance changes as you move around, because it doesn't draw rooms on top of each other. If the number of rooms shown seems to have decreased, try walking back to where you were before.
  
  
• Sometimes fixing up one-way directions (those with a small arrow on them) by walking to and from a room will suddenly make a lot more of the map appear, as the mapper knows now where rooms lead.
  
  
• Paths you have visited recently (in the last 5 minutes) are shown with a thicker line, so you can see which way you came from.
  

My mapper is pretty fast. Timing shows it renders in about 0.001 seconds.

This is what it looks like with the preloaded database, which shows area names:

Your current area is rendered in a different colour, to make it more obvious where area boundaries are.

And this is the pygmy village, zoomed out: