What makes you so convinced that those services will still be available? If the electricity goes off, there will be nothing to relay the data from the satellite network.
GPS satellites systems are not your average DirectTV sats. They have more hardening and more backup. It would take at at least an EMP to take them out or direct targeting by anti-satellite weapons. Both not likely in a economic collapse.
The above said, I never travel without backup maps or my trusty compass.