Because I don't need to use a compass around here, the removability of the Orca is a plus. It's easy to put on for locations where I do need a compass on deck. I also like to remove everything from the deck when transporting my kayak. Aside from that, I like to place the compass closer to me than way ahead in the kayak's compass recess. It's easier to read this way.
I checked the Orca against two Silva hiker compasses, one of them purchased about 20 years ago. All three matched. Big thumbs up for this reasonably priced, flexible-use product.