Introducing OpenPlotter hats!!!

[mgrouch]

I'm referring back to the original post, old but were the other Hats mentioned ever developed? The MacArthur Hat and the Slocum Hat? I would be very interested in both. Thanks.

I think this one could be what you are looking for
https://geekworm.com/products/raspberry-...sion-board

check also other ones on geek worm related to raspberry pi. 
There are UPS ones, USB hubs, Sata SSD, and CAN bus. 

And more expensive ones:

[color=rgba(0, 0, 0, 0.8)][color=rgba(0, 0, 0, 0.6)]Strato Pi SPBC12X board (https://www.sferalabs.cc/product/strato-pi-can-board/)[/color][/color]
[color=rgba(0, 0, 0, 0.8)]Strato Pi SPBC12X board:[/color]

• 9-65Vdc power supply, with surge and reverse polarity protection
  
  
• Controller Area Network (CAN) V2.0B interface, supports speeds up to 1Mb/s, with opto-isolatorand electrostatic discharge protection
  
  
• standard RS-485 interfaces to the Raspberry Pi serial line, with opto-isolator and electrostatic discharge protection
  
  
• real time clock with replaceable CR1025 back-up battery
  

[color=rgba(0, 0, 0, 0.8)]($140.00)https://www.mouser.com/ProductDetail/?qs=PqoDHHvF64%252BAaGJtJ2H51A%3D%3D[/color]
[color=rgba(0, 0, 0, 0.8)]or same without CAN-bus, model SPBB30X ($100.00):[/color]
[color=rgba(0, 0, 0, 0.8)]https://www.sferalabs.cc/product/strato-pi-base-board/[/color]

Thanks,