When people are going to regions where there is no cellular service, specialised GPS devices link to the satellite network to get more precise information. More specialised GPS devices are more accurate as a consequence (to within 15 feet).
Smartphone mapping improves your odds of accurate data if you remember to download the map region while you’re offline, but you may not have the time to do so if you’re on the go. Downloading huge numbers of maps may also be problematic if your smartphone storage is already almost full.
While specialised GPS devices provided more accurate real-time traffic information, the gap between both systems has narrowed considerably with crowd-sourcing applications like Waze. Although Waze works well in rural regions, because of the limited user base, you won’t get current information if no one else is on the same route.
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