Thank you for a great review Mr 350z. Came to know about your name after going thru this thread
After reading almost every posts, wanted to share bit of information from my side.
If you have a phone with 4" or better, I would suggest you to check android maps (offline) /test it before you jump on any 3.5" Maps. If you are buying, buy one having 5"/7" screen which can replace your head unit. (Reverse camera/Bluetooth/audio)
I had done a lot of research on GPS Navigation and believe me, none of the navigation (offline) are perfect at the moment [At least now]. Google Maps/Navigation (if you have data) works almost accurate (with lots of add - way points).
Problem with offline maps, they do not update as and when the route gets changed. They in fact come up with a big update for the whole city/state/country rather than updating the latest route change.
Eg: 1 year back we got a new underpass opened on my way home from office.It took 3-4 year for construction. Google map showed a deviation till the underpass opened. It took a month or so before it got corrected.
Coming to sygic:- They were showing straight route in all the map during the work. (many updates during the 3 years)
After the opening, i got another map update. Now, i see a deviation in the new map. Now there is no need of deviation as the road is opened !
There are many issues with other maps too. It goes and hit to a wall and say 'go straight'.
Sygic Maps (mapmyindia) are available for android store for 1399. You can get future map/software updates.
Regarding the battery drain in mobile : GPS is normally used with power (most of the navigation system always connects to 12v socket). So, you cant complain your phone for battery drain. GPS continuously connects with Satellite so the battery drain/ heating. It is absolutely normal.
Worried about phone calls while driving:- I have a simple solution. You get stereo bluetooth headset like MW600 from sony. Pair it with your mobile. Connect the MW600 with an aux cable to your car's aux audio port. You will hear turn by turn navigation on your speaker (if you chose aux) with phone calls. You can even play songs on your mobile and listen on your car's speakers.
I have a Dell Streak 5" and i use Sygic offline maps. Before driving long distance, i compare the map with google map. I add multiple way point, and then save the route.
Only down side is , I have not bought a car holder. that is quite expensive. around 3K for a car holder. (Good one) !
As i get alert before 200-300m, i dont even have to see the screen. So holder is postponed.
And, touch screen is normally better (capacitive) on phone than the device. Felt difficult/hard when tried few of them. Finally - Saw a few thread discussed about it. Since that was old thread, didnt re-open it. (Still learning forum rules)