I've been considering upgrading my Samsung 8" tablet to a Lowrance Elite as I'm not happy with the V V mapping on the tablet. It works great on the Garmin GPS, but to much clutter on the Samsung so I've been running both and now ready to move to one system. Wondering if I need a GPS antenna if I switch to a Lowrance? Anybody running it and have insight? There are several refurbished units on eBay but most don't include the antenna so it would be an additional cost. Open to other large screen suggestions as well.