Dani, should have mentioned I'm using my phone, a Motorola Droid Turbo.
My comparison was more to Google Earth than the chips. Cost and convenience. My phone is with me regardless and fits in my zipper breast pocket.
I have rigged a rechargeable battery box to make a portable GPS/Depthfinder. Garmin has a unit that sells on Amazon for around $100.
I'm not generally working on precision and typically prefer to keep things "untechnical", I used to be more gadget oriented, as I've gotten older I've transitioned to efficiency.