It turns out that when using the camera on AT LEAST the Blackfish the radar will still show targets, etc. Even when vehicle radar set to false in the showHud array in description.ext... I've only tried this on the Blackfish so far.
*Note this is in MP on a Dedicated Server.
Screenshot: https://i.gyazo.com/36a5a787a5446f525d2c843e19383c40.jpg