There are three options for privacy, which are explained in the photo at right (and in the app under User Location Settings).
To open User Location Settings, go to Argo’s settings tab by tapping the menu icon from Argo’s Home screen and choosing Settings. From here choose User Location Settings. You’ll be given the three options shown at right. You can change your selection at any time.
If you choose to be shown on the map, you will only be visible for one hour after you were last active.
If you would like your friends to see your ETA when on a voyage just turn on your ETA Sharing.