My wife has the Samsung Galaxy S5 Android and it gives the full GPS mapping plus a lot more than my Garmin or my Tom Tom.
Her Samsung S5 has a free GPS and travel AP that gives your actual GPS location with a blue dot on the road or in a parking lot etc within + or - 1 meter (+ or - 3 ft) on very detailed color maps and you can enlarge the area with your fingers to less than about 1 city block area in size, the elevation where you are to the foot or meter depending on which you select, your speed to 1/10 mph, Compass direction of travel to the degree, the engine RPM's, the posted speed limits where you are, the temperature F or C where you are, the humidity level where you are, your route planned and showing any traffic tie ups/accidents, etc and routes you around them, miles traveled and miles to go, gives any weather alerts and tells you when rain or snow will start and when it will end in hrs/minutes, and the screen looks just like our Garmin background map screen. Tap on the question mark and it gives a list of points of interest where you are or CG's or fuel staions or resturants, or stores, etc. Tap again and it gives the directions to what you'd selected. A lot more info given but I can't remember all of it without looking at it. Voice command operated if desired or type info in or select the locations wanted on the map also.
We just got back on Thursday night from a 2+ week trip to the Smoky Mtns NP from West Michigan and guess which GPS we uesd? Maybe better to say the Garmin wasn't even plugged in! Before she got her Samsung S5 a year ago, the Garmin was the best with our Tom Tom as a back up but now the Garmin is just the backup. I have a Marine Garmin for our main boat though as they don't have the high quality waterway navagation maps I want yet for the cell but they say it's coming in 2016. Cell will work over open water for 20-30 reliable miles from shore depending on where the tower is located. Sometimes it's worked over open water more than 60 miles from the towers but may become iffy.
My wife and her cell is our co-pilot and has gotten very good at it!