@swadesh In a smartphone, GPS plus data connection work best. But it will also work without data connection provided you have offline map app like HERE Maps. In this case, all map data is already saved, all you need is the GPS connection.
Data is mobile tower dependent. GPS comes directly from satellite.
Data connection is needed to render the map, give real-time traffic data, etc. Google Map without data connection is useless because it has no offline feature. The GPS will catch but the navigation arrow will fly on some blank screen :-)
Here's a jugaad for people like myself who haven't yet tried standalone GPS decides:
1) buy the biggest battery yet cheapest smart phone 4500 mAh and above battery, 5 inch
2) flash the ROM, install stock Android and strip the phone of everything. Keep only basic functions open.
3) uninstall all apps (everything including Gmail, Google Now, etc) and keep only Google Maps, HERE Maps and other maps (download them using WiFi, no SIM needed)
4) On long trips fire up HERE Maps and use GPS only. No data needed. No SIM card needed. Longest battery. Big screen. Etc.
Data is mobile tower dependent. GPS comes directly from satellite.
Data connection is needed to render the map, give real-time traffic data, etc. Google Map without data connection is useless because it has no offline feature. The GPS will catch but the navigation arrow will fly on some blank screen :-)
Here's a jugaad for people like myself who haven't yet tried standalone GPS decides:
1) buy the biggest battery yet cheapest smart phone 4500 mAh and above battery, 5 inch
2) flash the ROM, install stock Android and strip the phone of everything. Keep only basic functions open.
3) uninstall all apps (everything including Gmail, Google Now, etc) and keep only Google Maps, HERE Maps and other maps (download them using WiFi, no SIM needed)
4) On long trips fire up HERE Maps and use GPS only. No data needed. No SIM card needed. Longest battery. Big screen. Etc.