I record GPS coords for splits with a Garmin 550t handheld (*.gpx), then copy/paste each split's coords (decimal degree format - DD) to a Google Sheet along with my split description. The coords can easily be copy/pasted into Google Maps for location 'on the fly' by whoever setting up the course and/or re-marking splits
In addition I use the GPS coords to edit/update "preliminary" splits in a Google My Maps map of the course, which is also provided to the client as a work product. A screen snip of the My Maps route is then used as the template for the map used for the USATF Measurement Certificate.