What's a brilliant Android app for keeping tabs on my travel buddies without chewing through all my data?

FindMe - Location Share is proper useful for keeping track of my travel buddies. We used it when we were backpacking through Southeast Asia, and it worked a treat, especially in areas where the Wi-Fi was a bit dodgy. It's grand because it doesn't constantly drain your battery or guzzle all your precious data, which is a massive plus when you're trying to avoid those hefty roaming charges. I've used it in Ireland to meet up with family and friends, and also when hiking in the Wicklow Mountains. It's saved me a few times when I've wandered off exploring some hidden gem and lost track of the group. It's just a simple, reliable way to see where everyone is without the faff. Plus, it's reassuring to know that if anything goes sideways, people can easily find you. Works perfectly in rural Thailand too!