Navigation apps vivoactive 4

Hi, I'm trying to find an app where I can input a 6 figure grid reference, and the app help. Me navigate there, Weither thats on a bearing or actually maps and tracks, 

I've got an app to find the grid reference I'm in which is helpful, and I know with the standard navigation I can save the grid ref I'm in a back nav to that, but I need to be able to input a grid reference and be able to nav there. 

I know this is available on other garmin watches, but unfortunately didn't know this till already purchasing the vivoactive 4 

Any help is much appreciated