Yes, we currently work with Garmin and Simrad. Raymarine and Furuno are in production.
Proteus will only work on the display that the HDMI cable from Proteus is plugged into.
That depends on the capability of your radar. Proteus picks up what your radar picks up. If your object in the water shows up on your radar, then Proteus will display it as an “Unknown Object” or a channel marker/buoy. If items are too small to be picked up on radar, then Proteus will not pick up the object.
Yes, you can install Proteus yourself. However, we recommend you have it done professionally, and you may void certain warranties if completed DIY.