Cross-Platform Safety Tracking App

I am gaining peojects costs. This isnt our first app so we have some familiarity.
App for Hunters hiker's outdoors people in general. Get back safe . There is no way currently without a Epirb or PLB to share with friends and family. Your exact coordinates. When you are due back and if things change a count down starts then will notify people. Also providing an sos app button. Our app will help all outdoors people and it will allow family friends or partners to know theyre exact location and if they fail to meet the requirements or check ins it will start to notify the appropriate contacts