I did a quick searh on Chamorro and found the the link below. There is a picture of a boat like you describe and the following text:

The adjacent sketch is the only detailed drawing of a traditional Chamorro canoe known to exist. It was prepared on Tinian in 1742 and depicts the major features of the flying thrower including a narrow, asymmetrical hull, single outrigger and lateen sail. The largest sailing canoes were known as sakman.

The picture is blocked from linking, but if you follow the link, you can see it.

Regards,

Marcel