Our boat is coming with a Chart Plotter. It is a B&G. I have been chartering in the BVI many years and never had one. I have a Garmin hand held with blue charts and Walkers waypoints to get me to Anegada. Never had a problem. I looked on youtube and it was mentioned you need maps. Navionics etc. Do you plotters come with the charts installed our do you need them on your handheld (phone ipad?). Does anyone use them if they have been to the BVI's a few times. What is the feedback? use or not use Thanks in advance.