Film version
For those who want a different medium version of this, there was a well-received 1979 film which is available in a few places
(Amazon.com only, not .co.uk, but maybe also with a VPN?) https://www.amazon.com/gp/video/detail/B0F7JR1KCV/ref=atv_sr_fle_c_sr4e8ffb_1_1_1
OR
https://archive.org/details/riddle-of-the-sands

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Comments
Very nice - enjoyed that after reading the book. In the film, Davies boat was a gaff-rigged yawl, and Dollman's was a gaff-rigged schooner. Can't remember if they mentioned the boat riggings in the book.
I can see we're all going to get adept at small-boat nomenclature
I did a quick search in the kindle version, and an onlooker refers to Davies' boat as "your yawl". Also, the galliots are explicitly said to be "ketch-rigged".
Dollman's boat is variously called "a sailing yacht", "a barge-yacht", "built on the lines of a Dutch galliot" but I couldn't see anything about the rig.