Fascinating subject but in need of a good editor, this is too long, often bewildering and geographically vague or inaccurate, (Weipa is not on the eastern coast of Australia's Cape York peninsula but the western one. Which hardly inspires confidence at the beginning of a book on exploration and mapping.)
Places such as Adventure Bay pop up with no real context or reason and are never heard of again. Or are not given their modern names or easier identifiers (such as might be achieved by telling us that "Bay of Inlets" is modern Shoalwater Bay) . Flinders and Bass sail off from Sydney in search of a possible strait (later given Bass's name) between Australia and Tasmania and are suddenly inexplicably we realise in Tasmania (a sentence saying why they didn't just follow the mainland coast round through the strait would doubtless have made much clear.) Some people are described as "taking" a boat when it is important to understand (though it never becomes totally clear) that they are stealing it. Episodes get repeated in a sometimes confusing chronology.
There is massive pointless sloppiness. Spencer Gulf is said to be named in 1802 after Princess Diana's "great grandfather" the 2nd Earl Spencer. Some schoolboy spottable mistake here surely, given that Diana's birth was then another 159 years in the future (so yes, her great grandfather turns out to be "only" the 6th Earl, so the 2nd Earl had a lot more "greats" to his name than that). Does this matter? Probably not (so why include her in the first place?) but obvious blunders like this do make you wonder about the rest of the book.
Tedious often seemingly endlessly rambling pages are padded (the only word) with the preparations in Europe for voyages and for even less obvious reasons the backgrounds and private lives of all concerned. I have given up a third of the way through. Maybe it gets better, but I've tired of hoping so. Reduce its length, add a few linking and explanatory thoughts and clarify the geography would be my advice. Plus easier to read maps, at least in the Kindle edition. And then you'll have a pretty good book.
PS. I later went back to this book after writing the above and things picked up shortly after in the matter of describing the mapping of Australia. I have accordingly increased the star rating from two to three. But the infuriating sloppiness in the book's own cartography persists.
There is, for instance, a major episode in which Flinders gets wrecked with two ships. Where? Good basic question. The book scarcely gives a clue. It is clearly off the East Coast of Australia, but where, and at what distance from the shore (since no mention is made of the shore)?
The nearest to any precision comes only at the end of this long episode when mention is made of it being on Wreck Reef. But where on earth is that? Nothing here tells us, neither is it, nor any clue as to the wreck's location, shown on the book's maps (which turn out to be somewhat clearer on my laptop than on my Kindle).
10 minutes' Googling suggests that it is Porpoise Cay in the Wreck Reefs some 230 nautical miles off the present day town of Gladstone. But there is nothing in the book that tells you this. Nothing. I find it breath-taking, insulting even, that the location is regarded as not worth pinpointing for the benefit of those who have bought a book on the mapping of Australia.