Track gone from VFR map on bush trips?

I think this problem is common for a lot of bush trips. I noticed it in discovery Denmark Bush trip and now in Northwestern Kimberley coast. When there is map on the internet it is possible to finish the bush trip, but the Kimberley coast VFR map I did not found and the final trip is more than 1 hour long so it is impossible for me to try it on blind. I can’t see even the airport where I must land.
Screenshot of very “usefull” VFR map is attached.