Ephi and Sirken have both spoken to the camp rules and what constitutes "leaving" the camp here:
http://www.project1999.org/forums/sh...635#post837635
Generally, if you leave the camp you lose it.
That said, the current GM's have also stated that there are circumstances in which you can retain ownership of the camp despite leaving it. Such circumstances are generally undefined, but being trained through no fault of your own, going link dead, and server bugs are all probable scenarios that would allow you to retain your camp. If you have fraps, you are advised to run them in addition to your logs in order to prove your legitimate ownership of the camp should the need arise.