Here are the instructions for using RTKLib to process the PPK files from Non CORS Area
Step 1) You supply the GPS files from your base station (.19G, .19N, .19o) NOTE This process will only be as accurate as the data you supply!
Step 2) Launch RTKPost
How to Generate a POS file
Step 3) Click Options Button and setup the settings as follows
Settings 1
Settings 2
Output
Positions
Click OK Button
Step 4) Set all these Files
Step 5) Execute the process, Click Execute Button
Step 6) These are the results of a successful process, Click Plot Button
Click View Button to see .POS file output
How to Generate a GPX file
Step 1) Click the KML/GPX… button
Step 2) Select GPX, Q-Flags - All, Output Altitude - Elliposoidal, Output Time - UTC
Select the Input/Output/GE Exe File
Step 3) Click the Convert button
Step 4) Click the View Button to see the GPX file that was created.
Optional KML Step
If you want a KML file, Select KML and set the path to your Earth Earth Exe, Click the Convert button.
Now that you have a GPX file you can use How To - Use GeoSetter to Update Photos GPS MetaData (PPK Processing) to read the GPX file and modify the photos exif GPS data.