I use regularly and a Garman 175 Map as a back up mounted and ready to turn on. I also have a thumb drive system and hockey puc GPS for the lap top. I also have a couple of small GPS's in the ditch bag. Even with all the electronics on board I haven't lost the idea that I need paper charts and a good set of binoculars for days when you need to "double the angle on the bow" or identify a mark.