Sorry, I've spotted another thing I feel is a bit odd. I've spotted it becaue sailing ships will feature in my next campaign, and I regularly do wargaming with Napoleonic ships.
On page 179 the average movement rate for "Ship, vintage sailing" is given as 6 km/hr. That translates into about 3 knots.
"According to Admiral Beaufort, a man-of-war in this [Napoleonic] period...with all sial set...when the wind reached 4 knots...would go in smooth water 1 or 2 knots. A gentle breeze of 7 to 10 knots would give the ship 3 or 4 knots of speed, while a moderate breeze of up to 16 knots would give the ship 5 to 6 knots." Lavery, B. (1989) Nelson's Navy. Conway Maritime Press, London.
Granted this is in the period when sailing vessels arguably obtained their pinnacle, but a man-of-war is a huge, heavy ship. Although the sail set gets smaller with smaller vessels, so does the hull cross section and weight. Frigates were known to sail significantly faster. Also granted, the BRP category covers everything from cogs, through figates, through men of war, through to tea klippers. In addition, winds range from still to hurricane.
But I still can't help feeling, almost instinctively, that the speed given on page 179 is too slow. I would suggest doubling it.
Hmmm, me thinks a BRP supplement dealing with the age of sail might be worth while
