1. One strategy I picked up somewhere is to tell your lost kids to look for "a mommy with a lot of kids". I think it's smart, because even relatively small and/or scared kids can understand when they see another family about, and there will be even more families than CMs. It's safe, because I don't think there's any chance a family is going to turn into kidnappers and human traffickers when they discover a "straggler". And who wouldn't help a lost kid? 2. You can get a passable, new, unlocked cell phone for around $50 nowadays. You could get a cheap phone, set them up on Facebook Messenger or some other program that you teach them to use, and an 8YO can probably grasp it well enough to find you again. They would love being able to carry the phone around as a camera, and the adults could use it as an emergency cell phone in case the main one breaks after the trip. It's not perfect... they could lose the phone, break it, the wi-fi in the parks isn't perfect, etc. but at least FB Messenger will keep trying to send its message until it gets a connection.