Please identify the smart phone apps. for that you have navigation that you have tested and found helpful.

I have found this one to be interesting. This app provides locating data while taking a picture. This is for the iPhone:

https://itunes.apple.com/us/app/geocam-free/id435668911?mt=8


I do like the android display better than the iPhone.
Blake

www.outdoorquest.blogspot.com

Gaia gps

Topo maps

GPS Drive

GPS kit

Walk Tools

I use a variety because some have better maps a different scales and some need less bandwidth and can store maps on the device. The ones I use the most are Topo maps for rural areas and GPS Drive for urban areas. Google Earth and the maps function on the iphone also are helpful.

... and please clarify the operating system(s) that the apps are available for, if known (iPhone, Android, Win8, ...).

On a side note, just before Christmas I updated from a Motorola Droid 2 to a Motorola Droid Razr Maxx. The improved battery life on the new phone is amazing compared to the old one. That was becoming a real issue.