If the group is running together you don't need to track the whole group or even half the group.
APRS was meant for situational awareness, but has turned into not much more than GPS tracking. But that aspect alone can be used in a variety of situations. Multi-group trail runs, search and rescue, storm chasing, lets the wife keep tabs on you, can track your vehicle if it is stolen, etc.
As previously mentioned you can send messages to other APRS users as long as they are running a full setup as opposed to a tracker only set up, you can send text messages to a phone and emails.
I had an extra Baofeng HT ($30) laying around, purchased a Mobilinkd bluetooth TNC ($65) and a cheap android tablet (Asus, $80) off amazon that has bluetooth and gps and with a mag-mount antenna had a fully function APRS set up where I can see stations on a map, send messages, etc. I spent a little more than I would to buy a new SPOT beacon but have no subscription to pay, ($200+ a year) and I can not only track myself, but I can track others.
APRS.fi and OpenAPRS.net are both good websites, but if you look at your area on the map and don't see anything that doesn't necessarily mean there isn't any APRS activity in the area it may just mean there isn't an IGate to pass the info to the internet.