How to discreetly turn off location on iPhone?

I'm currently sharing my location with someone on my iPhone… If I stop sharing it with them will they be notified? I just wanna do it for a few hours and then turn it back on but I don't want them to know. Or will turning off my cellular data block them from seeing my location?

They will be notified, when they go to text you it will show in your messages. It will say "____ has stopped sharing their location with you and the time."

Turning off your data would kill your internet connection (unless Wi-Fi is available). Nothing to do with location (directly anyway).

As far as stopping the sharing & other person being notified it depends on what service you are using to share your location.