When using a map and compass for navigation, do I use declination or not?

I am probably over-analyzing this. We are having a camp-o-ree next weekend and one of the stations is orienteering. It’s been a long time since I have done land navigation without GPS. Do modern maps compensate for magnetic declination? I can’t seem to Google a definitive answer. The more I think about it, the more confused I get. I know we are 5 degrees off here, but do I use it or not?