1. A marine display device comprising: a. a housing, b. two or more ports; c. two or more image devices; d. two or more image modules, each of the two or more image modules including: i. one or more components that process an image generated by one of the two or more imaging devices; ii. a port that connects each of the two or more image modules to one of the two or more ports of the marine display so that the image modules are capable of being connected and removed from the marine display and iii. a port that connects one of the two or more imaging devices to one of the two or more image modules so that graphical or pictorial images of underwater sea life captured by one of the two or more imaging devices can be transmitted from the one of the two or more imaging devices to one of the two or more image modules; e. a display screen located within the housing that displays the graphical or pictorial images of underwater sea life, displays one or more global positioning satellite locations, one or more menu options, or a combination thereof, f. one or more sensors for detecting contact of the display screen by the user so that the contact by the user controls one or more functions or the marine display device; and g. one or more internal power supplies; wherein the marine display device is a fish finder that is portable and displays the graphical or pictorial images of underwater sea life without being connected to an external power source; and wherein each of the two or more image modules are discrete from each of the two or more imaging devices and are capable of connecting one the two or more imaging devices to the marine display device so that each the two or more imaging devices operate a distance from each the two or more image modules and the marine display device.