I spent a little more time this afternoon playing around with your Ride Plan and Google Maps :--
GS 9 - The address is correct (71 Princes Hwy, Tailem Bend SA ) but you have the co-ords of -35.68930, 139.33710. It should be -35.253581, 139.452443, and I think that this adds 45 km & around 35 minutes to your Day 1
GS 16
The address is correct but the co-ords should be -31.898778, 127.022687. This changes the distance / time from 223 km / 2.5 hr to 193 / 2.0 hrs
Some of the details for GS 56 & GS 57 are reversed.
GS 56
The location details are correct (address + lat / long) but the distance / time should be 151 k / 1.9 hr
GS 57
The location details are correct (address + lat / long) but the distance / time should be 303 km / 3.5 hr
If you intend to use Google Maps on your trip, be aware that it shows that the main 2 lane river crossing at Fitzroy Crossing in Western Australia is closed, and GM tries to route you 7 hours to the south. According to the Western Australia Main Roads website, there is a temporary 1 lane detour river crossing approx 4 km north of town.
https://www.mainroads.wa.gov.au/travel-information/driving-in-wa/kimberley-flood-response/
Enjoy the ride, it should be a fantastic adventure.