Many GPS units in phones will offer you a chance to mark specific points. You can mark your campsite and then feel free to walk anywhere you like--all you'd need to do is set your GPS to help you find your way back to your site.
Lack of Versatility
Many standalone GPS units will offer you many more options than your cell phone GPS unit. For example, a modern GPS will be able to give you weather conditions while the basic cell phone GPS might not.
More Pack Space
Using just a cell phone GPS leaves you with a lighter pack load, which any seasoned hiker will tell you is a blessing. If you truly need a GPS and a cell phone. it may be a good idea to get them in one device.
If you aren't getting reception with your phone, you usually won't be able to get reception on your phone's GPS. Some of the higher-end phones will use satellites for the GPS portion, but some will not.
Having a phone with a GPS unit will not only provide you with your location, but will also give you a way to contact emergency units, as long as you have phone reception.
Article Written By Heather Broeker
Originally from North Carolina, Heather Broeker studied journalism and advertising at the University of North Carolina. After graduation she moved to Los Angeles, where she worked for Fox Searchlight, Fox Reality and later as a writer and marketing director. Broeker now lives in Los Angeles and runs Head Over Heels, a writing and public relations company.