Need to add "While Using" Location Service option

Please add "While Using" option in Location Services settings. Most apps now provide that option and I prefer not to use Always on option because it drains the battery or is just simply unnecessary. I only need GPS turned on when I actually have the app open.
As for any reviewer saying this app needs an Internet connection, they are wrong. I tested turning off both Wi-Fi and Cellular Data and it works perfectly fine outside with a clear reception to GPS satellite. Maybe they tried testing indoors or had Location Services for the app turned off. For me it works perfectly fine on my 6s.

Mdward2 about GPS Device Data