New friends!

But the white triangle shows up again. And transforms into a yellow-blue striped wing. Not a butterfly but a genaker sail. Why not say "hello"? Calling them up on the vhf radio I find myself talking to the Dutch ketch, "Jobber". We've apparently met at Union Island in January. We exchange weather information and plan to call again tomorrow morning.
After a day of genaker sailing in light winds "Jobber" is again nearby by nightfall.

Nice to make new friends.