Which can be used for Navigation for bike,I would do trips on whole India as parts. Which is gud a Android phone with Holder & Charger or a GPS device.
Since, you plan to travel for a long period of time, getting a dedicated device would be a wiser choice.
Garmin has a GPS device for motorcycles named Zumo. Please check.
A Microsoft Lumia 535 phone will serve you well too.
All maps are off-line and are free for life; voice guided navigation, 5 inch display, dual SIM mobile phone.
Selling for Rs.6000/- these days.
HERE maps are available for Android as well these days. Fully offline and free (Not sure for how long as it seems to be sold to a consortium of german automobiles) .
I have a lenovo k3 note Android phone which has 5.5 inch screen its advice able to fit Holder & charger for this phone or to buy a GPS device. How much will a GPS devices cost ??