1) Select a navigator en route to an outpost. 2) Reroute the sub to another outpost. 3) In the sub's window, tap "Jump to arrival" 4) The game map focuses on the navigator's sub's original destination, not the new rerouted destination.
I did the same thing, but when I clicked on "Jump to arrival", it locked my choice for the rerouting. Almost like a "Finalize Hire", but it's "Finalize rerouting"