When building my second Tarot 650 Sport quad, I ordered a M9N GPS/Compass module from China. Due to a screwup in China I ended up getting two modules for the price of one (except I had to pay tariffs on both). Anyway, I’m sitting here with an extra module and while installing a telemetry module I was wondering if I might install a second GPS. The only advantage I can see is redundancy. Are there any other advantages that would motivate me to bother installing it?
AFAIK the only reasons to use dual GPS are
- GPS for Yaw, but that IIRC requires either dual antenna receiver or RTK capable receivers.
- Pleasing aviation authorities
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With a spare GNSS unit on hand I would take that as a good reason to build another copter - you’ve already started 
After examining hundreds of logs of copters with two GNSS units I’ve never seen any clear reason to have two.
If you think one might fail or suffer interference then you could add a second of a different brand or series.
Having two the same really only helps if your poor wiring fails.
I’ve had the same thoughts. Unfortunately, I built a second Tarot quad starting with spare parts I had accumulated from the previous build as well doing repairs from several crashes. I now have two Tarot 650 Sport quads:
Given the limited capabilities, I’m not inclined to build another one. I also have an old Mavic Pro that I would like to retire and replace with a newer model. The quad on the right is complete and flies really well. Here is a video of a recent waypoint mission: click here.
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Do it while there is domestic stock. DJI craft cannot be imported any longer.