I thought I'd share how I use the flight planner and the Gps to fly from one airport to another. My current project is to fly all 32 hops here in the flightsim.com mulitplayer server. This example was created while flying hop #6 from 1o2-KSAC.
First I use the flight planner as normal
Next I zoom into the destination airport to get a look at it.
I have noticed by reading the posts here that other pilots are wanting to add waypoints to the flight plan when using the default FS flight planner. I discovered how to do that. The flight planner draws a line from the two airports. To add a waypoint, simply move the red line to a waypoint. This picture shows that I want to fly over one of the waterway airports that is on one of the lakes on the way to KSAC.
Next, I want the GPS to fly me to the ILS. I like this feature a lot. It makes flying a lot easier.
After moving the line over to the SAC vor thus adding it to my flight plan, I saved the flight and loaded it up into the GPS. Now I'm ready to fly.
Once I'm close to the ILS, I fly the plane as normal, I switch to NAV and APP to fly the ILS to a landing.