The bigger the screen size is, the better the user experience.
2.has an external memory slot
The device has a standard memory slot (such as an SD or micro SD card slot) that enables you to extend the built-in internal storage with affordable memory modules, or easily retrieve data, such as photographs, from the memory card.
3.battery life with GPS on
There is less chance that you will run out of battery during an adventure.
Resolution is an essential indicator of a screen's image quality, representing the maximum amount of pixels that can be shown on the screen. The resolution is given as a compound value, comprised of horizontal and vertical pixels.
You can operate the device easily, by pressing the screen with your fingers.
6.LCD display with 3 subpixels per pixels
The device has an LCD display with 3 subpixels per pixel, resulting in sharp and crisp images. Pixels in some displays (like AMOLED) share one subpixel to preserve space. This can result in a less crisp, slightly blurred image.