Knowing a mapper (union member in good standing that applied for the position, that has many openings still available for any of us to apply) the reason given for the delay was the refresher (computer) course was not operating correctly.
The reason scanners don't pick up in areas with no cell service is because they are linked in by cell tower, not satelite. They "project" in areas with out cell coverage and are quite accurate, but not prefect.
Scanners "ping" every minute or more when an action (scanning) is applied. They are generally accurate within 8 feet. They continuously leave a trail of blue dots (bread crumbs) every minute or less. After a 2 week period the bigger blue dots are usually box stops, traffic stops, break spots, or some other regular "pit" stop point. That's how they can tell if a carrier regularly runs a stop sign, no conglomeration of blue dots, no stop.
The delivery point scan is especially important to do correctly, because during the mapping, when you show where you deliver packages, there should be a blue dot there or nearby. If only at the place you park, that looks like "that" is your delivery point. The scanner info also shows if you back up in your vehicle, or if you are walking. You may have noticed safety talks have changed from NEVER BACK to back safely, after "seeing" there are good reasons to back.
With much of this scanner knowledge you are able to have some fun with the district scanner watchers, as has been posted on other threads. I can't wait to try the one DB has mentioned, tying a 10 foot rope to your scanner strap and swinging it around your head for a few minutes, when ever you stop and no people are home.