Strange sailing equipment, junk or keep?

[Scylipt]

Hi,

I recently bought a sailboat that was full of equipment.

The attached pictures are some of the things I'm not sure about. The triangle and circles are 2 pieces of plastic that slot together.

What are they and are they worth keeping?

Thank you.

 

[Dale Tanski]

The map sliders you are referring to are sail battens...

 

[reedhedges]

The black triangle and ball are day shapes: Day shapes - Wikipedia

 

[Scylipt]

Yes, a fellow sailor explained this to me recently, so definitely not junk

The map sliders you are referring to are sail battens...

 

[Scylipt]

The black triangle and ball are day shapes:

Thanks,
A sailor explained that the circular one is to show you are at anchor, and the triangular one that you are motoring.