Those teams who chose to navigate made the easier and faster choice.
Those teams who chose to build a sign had much difficulty in getting the order right. Over and over again, they had to rebuiild. The team that had been in first place through the first three episodes lost a tremendous amount of time before they decided to do the Navigation choice. Here again they lost more time as Rob directed them the wrong way.
Once all the teams had their detours completed, they received instructions to return to the airport and fly, via one of three chartered planes, to Ushuaia, Argentina.