If you use Breeze Downloader Pro to copy your images from the camera/cardreader to your PC, then you can tell it to automatically add GPS data from GPX files when the images are copied. That's the way I do it.

I don't want to hijack this thread, but I think the following is still on-topic.....
I also use Downloader Pro to ingest images to my PC. It nicely creates xmp sidecar files with the GPS coordinates for each image during the downloading process.
My out of camera original images are in raw format, so I have to process these raw files to arrive at JPG files.
On my system the derived JPG files are stored in a different folder hierarchy, which means that the geotag information is not readily available for the derived files.
I am just wondering if there is a way to link the geotag information from the raw xmp sidecars to the derived jpg files. A script could possibly do that, but I have not found something like that yet on the wiki. My scripting skills are not developed enough to write one myself, but that may have to change when there is no alternative

I think an easy option maybe to use a script like Ferdinand's Image Synchornization script to synchronize the xmp (or any other information) for the derived jpg with the raw file's xmp.

There is also a small script which ships which IMatch (Scripting menu > Scripts > GPS and Geo-coding > Set GPS coordinates which allows you to enter GPS data for your images.

The script expects that you have ExifTool.exe installed (see: http://www.sno.phy.queensu.ca/~phil/exiftool/ download the Windows Executable).

Not the maximum comfort, but working quite well.

Other users have written scripts which import track lists, way point files etc. directly in the images. Just visit the photools.com Wiki and enter the search word GPS to find scripts and info related to GPS.