Guess what this is

[Timdogg]

I'm sure someone will get this right away

[tipper75]

That is correct and those are really cool tugs Next picture please?

[Timdogg]

Not hard for me! It's a radar reflector used to make sure other boats can pick you up on their radar, its most commonly used in small crafts made of wood or fiberglass due to the fact that they are picked up poorly by radar, like your sailboat! I only know because one of my many tasks when I worked at this company was to install them!

[tipper75]

It has to do with boating and it is about being seen!

[RBS]

stumped, it looks cheaply made in someones welding shop, not hi-tech.

[tipper75]

Nah, not for looking, for being looked at

[RBS]

a camera is mounted in that (from the clue)

[tipper75]

Boating, but you knew that

[donaud]

Got me !!

Something to do with wind, or boating ?

[tipper75]

Should not be too hard:

[donaud]

Yes !

Also known as an Anchor Plate (not just for earthquake-prone areas).

[tipper75]

To me, it looks like an earthquake bolt, used to reinforce older buildings

[donaud]

I may have posted this a long time ago, not sure.

[-cristina]

Yes it is! Bravo!
Now it's your turn....

[donaud]

It's an Antikythera mechanism.

An ancient mechanical computer designed to calculate astronomical positions. Shown is a recreated model.