Also remember, you need 2 units that will share waypoints. If you are marking waypoints using sidescan at the helm, you need to see those waypoints at the bow to catch those fish. You won't be able to do this by mixing different brands. Assuming the Hook 7" has a data cable plug-in, you can buy an Elite TI for the helm and run a data cable to the Hook. Lowrance runs Navionics which is arguable the best in cartogrophy. Especially if you buy the CMAP chip later for color shading and live custom mapping. The Elite Ti also has bluetooth for your cell pn. Not sure what is still available from Lowrance in the Ti as they have gone to the FS model which is more expensive. Either unit is also wireless with each other- Ti to Ti, or, FS to FS. Means you don't need data cables for comm. My guess regarding 2021 Black Friday? There will be some great deals on the FS ! IMO