I installed the Aquameter compass (available from Chesapeake Light Craft). Haven't had a lot of chance to use it yet, so the following opinions may change over time. The durability concerns I raise are purely guesswork at this time, since I lack definite data.

This compass is lightweight and simple.

I chose this model because it's easy to read and easy to install. The mount is flat and shallow enough to just screw onto a wood plate which forms a deflector for my foot bilge pump outlet. (Pictures to be posted soon, when I sort out some stuff with my ISP). Mounting is right about where my feet are. This seems like a fairly good spot for a largish side-reading compass - near enough to see easily yet not requiring too much "look down at the compass/look up where you're going". My arms/torso are long enough to be able to reach it from the cockpit, but that's a stretch. Shouldn't be necessary since there is no bezel.

I also like the way it looks. Probably not the best reason to choose a compass, but it was one factor for me.

I have some concerns about durability. The clear plastic dome has no protective cover.

It has no provision for internal lighting. Some compasses either have a light bulb installed or may have a slot for a miniature chem stick. I haven't used an illuminated compass, so I do not know how important that could be.

The compass can be pried off the base - it's held on by a sort of flange-and-groove system that relies on the flexibility of the plastic to allow removal. There is a very clear ridge on the base & compass that allows you to line the unit back up properly when reinstalling. The mount may wear out after many remove/replace cycles or if forced in very cold weather.

Hope this info proves helpful.