@Flashpoint: I've found that the performance downfalls for "cell phone navigation" compared to dedicated portable navigation devices has less to do with the GPS vs. aGPS factor and more to do with the fact that a PND has an embedded map database stored right on the device, while cell phones use an off-board database which causes very slow route calculation/re-calculation, map display times, etc...because all contents need to be downloaded, handled, and finally displayed.
Without looking into the specs, I would assume that Nuvifone will have an embedded map database stored on some local media like MiroSD or internal flash memory. In this case, GPS navigation would perform really well (at least at the level of current Nuvi products.)
iPhone can also perform Navigation tasks this well if it stores some or all of a map database locally, or if the connection speed is extremely good (just don't expect it to guide you anywhere rural where signals suck if that's the case.)
Depending on the implementation, aGPS can be fantastic or utter crap. If it's the type that requires a constant network connection to maintain location accuracy, you might get decent performance in a city, but in rural areas it will suck. If it's the aGPS that can operate without a constant, or even non-existent network connection, you're good to go.
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@Flashpoint:
I've found that the performance downfalls for "cell phone navigation" compared to dedicated portable navigation devices has less to do with the GPS vs. aGPS factor and more to do with the fact that a PND has an embedded map database stored right on the device, while cell phones use an off-board database which causes very slow route calculation/re-calculation, map display times, etc...because all contents need to be downloaded, handled, and finally displayed.
Without looking into the specs, I would assume that Nuvifone will have an embedded map database stored on some local media like MiroSD or internal flash memory. In this case, GPS navigation would perform really well (at least at the level of current Nuvi products.)
iPhone can also perform Navigation tasks this well if it stores some or all of a map database locally, or if the connection speed is extremely good (just don't expect it to guide you anywhere rural where signals suck if that's the case.)
Depending on the implementation, aGPS can be fantastic or utter crap. If it's the type that requires a constant network connection to maintain location accuracy, you might get decent performance in a city, but in rural areas it will suck. If it's the aGPS that can operate without a constant, or even non-existent network connection, you're good to go.