Jim of Wild Blue is right , inavx works. I went down to south Georgia to help a friend move a 38 foot trawler from Darien to Savannah. I put my ipad with the inavx by the helm and all eyes went from the Garmin chart plotter to the the ipad and stayed there. After dark I was at the helm and we had no search light but with the ipad I was able to navigate the marshes with no problem. And I dont know beans about boat navigation in tight channels. I hasten to add that there are no real rocks in the area just mud and marsh so screwups are soft landings. As long as power is on and the satellites are up this thing makes it easy.
slowtrot
slowtrot