I'm looking for something in the way of a good cutlass manual. Alas, the search function gave me no joy, and google keeps giving me information on sword cerimony in modern navies. :(

Can anyone give me a good cutlass manual from 1600-1820?

The ARMA site has a thread on this, though it's towards the end of the time you're interested in: http://www.thearma.org/forum/viewtopic.php?t=...ht=cutlass

You want the Dussack section of Meyer.

I'm pretty sure there are some naval cutlass manuals form inside you're time frame, admittedly getting towards the later end.

Allen's suggestion of Meyer's dussack is good, though slightly early for what you're looking for. For later stuff look into Hutton's Cold Steel (which I think is online somewhere), or any of the broadsword training manuals, such as Henry Angelo's Hungarian Broadsword manual.

Go here: Historical Maritime Combat