Originally Posted by SailPenelope
I have a handheld Garmin GPS.
Yes, its easy depending on the Garmin GPS. I have the GPSMap 76cx
On the back of the unit are 2 rubber covers to 2 holes. The smaller on is for a USB plug. The GPS end needs to small USB plu and the computer, obviously, needs the normal size. If you have a digital camera
etc you should have the cable to fit somewhere. otherwaise off to the computer shop you go!
Then you have to set the Interface in Menu/Menu to Garmin and plug it it. Mapsource has a little Upload to GPS button and should find the plugged in GPS. There is also a download from GPOS button too
I hope this helps.
OOOOOPs! Of course I didn't read the question properly!!! You can not use Mapsource as a chrtplotter with real time updating from your GPS. Garmin, the little cons, want you to buy a chartplotter from them for many thousands of dollars to be the same size as your computer screen
As other posers have said a good free one is OpenCpn