There are a number of video tutorials on the RWDecal YouTube Channel to help you get the most out of RWDecal. Here you can find links and full details of what each video shows.
Installing and Configuring RWDecal
Setting the RailWorks / Rail Simulator folder, developer and product folders
The RWDecal Improvement Program
Calibrating Google Earth
How to Create a Decal for RailWorks using RWDecal
Brief description of form settings
See a decal actually being captured
The difference between decals created with licensed and unlicensed versions of RWDecal
The difference altitude makes to decal quality
Where decals can be found when using RailWorks / Rail Simulator
Explanation of the Due North Fix (rotation of a decal)
A Guide to the RWDecal Graphical User Interface
A run down of key form and menu options
How to use the Grab System
How to use the RWDecal Grab System
Detailed explanation of the best way to mark out areas using "Marker Pairs"
How to prevent overlap between markers
How to mark out more than one area at once
How to adjust the Google Earth "Fly To" option to make things easier
Loading Coordinates & Multiple Decal Creation
How to quickly load coordinates into the RWDecal form for Marker Pairs that have already been created
How to create multiple decals once they have marker pairs configured
The Best Way to Position Decals
The quickest way to align decals to markers in RailWorks
Explanation of the chunk naming scheme
Creating Decals in Bulk
Creating many decals at once
Backing up a route and Cleaning Decals from a Route
Backing up a Route
Cleaning decals from a route when you are finished
How to Calculate the Due North Fix Rotation
What form settings to use
Why you this can't be done automatically for routes outside of the UK
How to input your results into the spreadsheet to calculate the rotation for you