Garmin owners
manuals are practically useless in my experience. The
hardware is actually pretty good. The owners
manuals don't even mention some of the features built into the hardware/software. For instance my wife recently picked got a great deal on a Garmin GPSmap 78SC . It comes with a USB port. Yet the manual makes no mention of the fact that you can output NMEA sentences through the USB port. If I did not have previous experience with Garmin
documentation (or lack there of) I would have said it could not do it. So I started going through menus and found the settings that put the position information out the USB port. In about 30 minutes of manually walking through the menus I was up and running with my position speed and other information showing up on my Coastal Explorer. It also worked great on my OpenCPM. Whats more when it's plugged into the USB it uses the power from the USB port and not the
batteries. Imagine that. I run my Coastal Explorer on an old EEEpc from ASUS that is 12 volts and runs off my house
batteries, so power is not a problem for either the computer or GPS. The GPS I normally use with this set up is a Garmin GPS18, but now I can use the 78sc as a backup as well. I use the chart plotter at the
helm for
steering and the netbook for navigation. I have the netbook set up so that when I close the cover the screen turns off and it uses very little power. I also have a 23 inch TV/monitor that I can
plug in when I want a larger screen, though 99% of the time the netbook screen works just fine. I download fresh official NOAA
charts onto the netbook when I am getting ready to move. The primary problem with the netbook and most other laptops is that it is not sunlight readable, at least not easily and must be used below
deck.