make and print your own basic topo maps at caltopo.com

That's what I've been doing but it's not as easy as the Trax sheets were.

You can go into Scoutbook and run a report for the Den and just the adventure you are working on that meeting and then print that.  

I think another fun orienteering-based activity would be to take a hike and do a scavenger hunt along the way for features that would be listed on a map: old stone wall, streambed, large rootstock, lone tree, reentrant, etc.  If you can get a trail map, even if it isn't a topo one, they could draw in the symbols that correspond to those features.  Or even without a map, just have some large copies of the symbols and when they find something that is represented in the list show you the symbol.

Oh, this is fantastic! Thank you so much! The question of skill progression is not my forte - I have no background in early childhood education - so having some guidance of what you can expect is so helpful! I will see what we can do with this. I see you can get orienteering kits online and we also have a club in town whose white course we might be able to borrow.  Thank you 🙏