Flight Plan-adding approaches

New Guy-when loading a flight plan does the unit have to have locked on to GPS sats? Sitting in my hangar have loaded a flight plan but no approaches can be found to add in to plan. Talked to TECH today and-they will get back to me. The 540 is brand new and learning it is a step
for this old guy-never learned that G stuff way of nav. I have followed the pilot guide with no luck. Suggestions? Have played with the simulator so have the basics.

I start from my home apt to list several local apts that have several approaches.
When I insert the airport into the flight plan and then try to get the list of approaches -nothing!!I have tried every trick but nothing works-click on PROC-nothing-talked to tech in MLB-no help-they will get back to me. Followed the pilot guide to the letter-nothing works.

Works great now. Have to review the old adage: READ EVERYTHING BEFORE DOING ANYTHING. But now my color printer has just croaked as I reprint/review the pilot guide page by page-oh wait a minute-it is Friday the 13th-I should have known!

So it goes-the adding approach situation has led to losing my heading annunciation on the map page.
Now it displays track up on the map. How do I get my heading back as it is there from the Aspen previously when I was in the vfr operating mode?? I missed something??