Mercury's VesselView Mobile app, first announced in 2016, works in conjunction with a plug-and-play engine module (measuring 6-by-1 1/2 inches) and the Bluetooth function on your iOS or Android smartphone to provide boaters with instant access to engine data for up to four SmartCraft-enabled outboards. VVM provides detailed information on your engine's performance and can notify you if something's amiss. Mercury says the data is more accurate than most analog gauges, providing a better sense of true rpm, fuel burn, speed and fluid-pressure levels. VVM can save and share boating experiences with others, keep a calendar log of fish caught and share those with friends across social media. Until the end of March, the VVM module, which mounts inside the cowling, costs $149.99 (45 percent off the regular price of $275).