Sounds like you're new to navigating, so make sure you have a strong string on it to enable you to place it round your neck if needed. Why? I was in a "whiteout" once and the only thing between me and dying of hypothermia was my Silva compass, (no, I didn't wrap it round me.) I hung on to it like grim death thinking, " If I lose this, I'm stuffed."
Silva Exp 4 is excellent.