Imo, Turn by turn navigation is a crutch that only delays someone from becoming an effective courier. With practice, you should be able to look at a map and memorize the turns to your destination. Just like you should have memorized your next 3 to 5 stops. Sadly, fedex has givin up on developing drivers with those kind of skills. Better to pay as little as they can and hope DRA will get them there on time. Problem is, DRA can't adjust on the fly. Weather, changes in traffic patterns, added oncall pickups or reattempts have to be calculated into the route after the driver is on road and those kind of skills take time and practice to acquire.
This is way I think primarily pickup routes are more challenging then deliveries. On calls are booked throughout the evening with one hour commitments and lots of unknown variables (pieces, weight etc often with incorrect info from the call centers). All of this has to be accounted for by the driver. This is why I thought it was incredibly dumb of fedex to cut out shift differential pay. If anything, they should have increased it to try and retain more experienced drivers on the PM shift.