Is there anything else to do after getting rid of Iskra? I can't find the camp from the letter. I had the theory that you have to search the radio frequencies on full moon and then explore in wolf form on the next full moon, but nothing. I don't understand the game.
Thank you for your comment - sorry this last puzzle was difficult to understand!
The purpose of Moonlight Fortress is just to demonstrate a concept I have for a game. For all intents and purposes, you have already experienced all Moonlight Fortress has to offer. Finding the base just ends the experience. If you still want to find the base, I have included a walkthrough in the handbook (available from this page).
Alternatively, here's a hint: if your survivor keeps getting lost whilst exploring, I wonder if there's an item that can help prevent them from getting lost again?