Installed the Garmin 740s,hooked up the tr1 and the vhf200 and linked them all together.plan on calibrating this weekend out on the milwaukee ocean.I use my Ipad as my second GPS,as a secondary it works fine.So far,in the driveway, I am really liking this Garmin,easy to use like all other Garmin products I have used.Previously on my boats I have had Humminbird equipment,but I like the fact the 740 can hook up radar and weather in the future