Best I've found – Geotag Photos Pro 2 Review

I've tried several other programs and found this one to be nearly foolproof yet comprehensive. I especially like how it keeps logs of your individual journeys. I use this program to tie my pictures to the mapped location in LightRoom when traveling. You don't need to use cellular data. Just put your phone in Airplane mode. If you automatically back it up to Dropbox using WiFi, you can match your photos very easily to their exact locations well after the fact.
Review by GDR1 on Geotag Photos Pro 2.