I use a magellan mobile mapper 6 with memory map chartplotting software. It nicely handles my noaa and canadian bsb raster charts. It is kinda a swiss army knife of devices with a flux gate compas, excellent gps, camera, flashlite and a bunch of other stuff in a fairly bulletproof case. I particularly like the fact that it uses AA batteries and I know for a fact that the screen will stay fully bright while tracking/logging the position of the vessel for at least 5 hours on one set of batteries. I do not know how long the batteries actually last because in my survey work I change them daily. I bought one of the first magellan gps's years ago and felt so burned by the company that I swore I would never buy another magellan product. This little hand held made me change my mind .... NO connections .... Just a happy customer, Jim Slocomb R/V Sea Otter