dude congrats for your work. I know the point is DIY but if you have powerfull receivers u can connect it to smartphone and use the apps which are very good also.
a great product is the software near completion to a stage where you're happy to release it relatively bug free, also is the GPS just laggy in the video as you are screen recording, or do you think a slightly more powerful Rasberry Pi is required? Would love to see this project completed and hope you do a video in the future with a full guide on setup, good luck with the project.
It's set to update every 1sec, the new version is twice a second and is much better. The power of the raspberry pi is the issue. It is getting near completion, I'm adding in a new gps unit, I will make an updated video soon.