This is a quick tip related to something that I just tried today and that worked.
My camera SONY DSC-HX100V has GPS capability built-in but it won't work everywhere and it needs some time to acquire the satellite signal. This way if you just want to take a quick snap you may end with photos that don’t have GPS location in their Exif metadata. GPS is a recent capability when we talk about cameras.
Figure 1 - SONY DSC-HX100V camera with built-in GPS
Taking that into consideration, let’s say you have some photos in iPhoto (Mac OS) or whatever program you use to manage your photos. I mention iPhoto here since it’s the app I use. Those photos don't have a location set due to no GPS signal available where the photos were taken. So how can one add that missing GPS location info/data on those photos? By the way, this process is called geotagging.
This is what I’ve tried and what worked perfectly in my case:
1 - Open Google Maps and find the place/point where you’ve taken the photos.
2 - Right click that place/point you want in the map and select Center Map here.
3 - Click the Link button. Black mouse pointer is over it in the screenshot bellow.
A popup box will open. Copy the text/URL and paste it in your preferred text editor app. The link will look something like this:
Pay attention to the highlighted part that correspond to the longitude and latitude data.
4 - Select the photos you want in iPhoto to apply Location information and press command+I to access the Assign a Place box. Copy the highlighted text above and paste it in the box. Press the enter key to finish the task.
Figure 3 - Adding GPS coordinates to iPhoto Assign a Place box
This procedure works great when you just want to add GPS coordinates in your photos no matter if your camera has a built-in GPS or not since any photo can be geotagged nowadays.
Hope it helps!
You can check my photos in this slideshow: