BambooSMP live map
The map draws every build and path as you make it, questionable cobblestone towers included. Pan around to find your base, or see how far the roads have got.
It opens in its own tab, so it gets the whole screen. That makes finding your way around much easier than in a small window on this page.

Not everyone wants to be on a map
Some people like being findable. Others are building something they'd rather show off once it's finished. Both are fine, and you don't have to explain which one you are.
/map hideSlip off the map
Your marker disappears for everyone looking at the map. You keep playing exactly as before; this only changes what the website shows.
/map showCome back
Puts you back on the map. There's nothing else to undo, and you can switch back and forth as often as you like.
Type it in chat like any other command. It sticks: log out, come back next week, and you are still hidden until you say otherwise.