Q: Why won't Find My Friends refresh to current location?

My Find My Friends app rarely works correctly. Every now & then it will show me the current location of the "friend" I am looking at but most of the time it will only show me where someone was 30 mins ago or however long. That really seems pointless as I'm not interested in where someone HAS been. I thought the idea of the app is to find someone's current location? Pushing the refresh wheel does nothing at all.

I have tried deleting the app & re-installing it many times along with rebooting the phone. I have an iPhone 4S & I have confirmed that I have all updates & I am running the most recent iOS version.

Can anyone please shed some light on this for me?

Thanks so much!