Right. Of course you can do it that way. It's a lot more effort and faff, but you do you.
Personally I find it easier to just check where they are than look up timetables and send messages and wait for responses. I'll do me, if you wouldn't mind not being so controlling and judgemental.
I do love that those who are judgemental and controlling on other people's use of an app (which doesn't affect them in any way, shape or form) are the ones who are citing that they wouldn't use the app because of control! Yes, if you are controlling and judgemental or abusive or your family members are controlling and judgemental and abusive, you probably shouldn't use the app.
But in our family, where we have healthy relationships, we find the app a useful tool in certain circumstances, giving us quick, real time information in seconds. We don't use it for control, judgement or abuse, because we are not controlling, judgemental or abusive.
Of course, don't share your location with anyone you don't trust to not use it in a way that isn't reasonable. But in our family, we all trust each other to use it sensibly without control or abuse, so it's a really useful app to have.