[Q] Sony Smartwatch 3 Swr50. Need help, Trying to setup watch for checking MPH.. topic

I just got this watch 3 days ago, Sony smartwatch 3, for the reason it had its own standalone GPS reciever. I work for the railroad running trains. And can't have my smartphone on me. So I'm looking to setup my watch for checking the speedometer on the train. Specifically MPH, with a satellite accuracy mark as well.. All the apps I've been trying only work when my phone is on and connected with its GPS on. Anyone know of any androidwe apps that will work for me? Thanks!