Created a plan in LNM:
Loaded it into MSFS and it looked like this: not quite right but close enough:
Started the flight and got this: nothing:
Obviously this is quite useless. How can I get the LNM-plan to show up properly in MSFS?
You should be able to save the plan in LittleNavMap and load it in the sim flight planning menu. I haven’t tried this when the sim is already at the airport though.
FS2020 indeed accepts .pln
Notice the “Airborne” position at Bjorli on the World Map - MSFS doesn’t know of ENLB airport, treats it as a waypoint, and adds a leg back to ENGN - a flight must end at an airport.
LittleNavMap has little to do with that, it can’t add an airport in MSFS.
I know, I know, but it didn’t work here.
As far as I can tell the airport is there but at a slightly different position… When I zoomed in there was a runway and all. But I will give it another try with two airports of which I am certain they actually are in MSFS!
Think I found the problem. LNM uses the ICAO ENLB while MSFS calles the exact same airport ENBI…! Totally different code! Obviously this has to do with LNM not yet reading the MSFS database.
Okay, so in order for this to work you have to make sure LNM and MSFS are using the same ICAO codes otherwise it won’t work! I just created a basic quick plan between two airports that have the same code in MSFS and LNM and now it works! 
I’m missing a step…how do you load it into Mfs? Does it automatically get loaded when you save it as a plan or is there some other process?
Doesn’t ENBI stand for ENBI/SANDVIKEN (HELIPAD)?
ENLB is the correct code for Bjorli
https://aro.lfv.se/Links/Link/ViewLink?TorLinkId=163&type=AIS
Go to the flight plan map in MSFS and at the bottom you will see a LOAD/SAVE option. Click on it, browse to where you saved the PLN file and load it.
Interesting. Seems MSFS made a little mistake there then…!
Ok great …I thought load/save was for loading a scenario you had saved.
Thanks
guys when i try to add an airport as a departure that option is grey out .some one can help
MSFS load the departure and the destination, but don´t load the waypoints from the plan made in LIttle Nav Map
I think you have the same problem as I did: the destination (or departure) airport you selected in LNM does not exist (or has a difference ICAO code) in MSFS. Are you using the latest MSFS compatible beta of LNM? You can see things are wrong because of the straight line LNM is drawing from departure to destination: you shouldn’t see such a line. Try again with the latest beta or try again with two airports that have the exact same ICAO code in MSFS and LNM.
The problem is that since the plan leads you straight back from destination to departure MSFS thinks your departure is also your destination (or the other way around) and so… you don’t need a plan plotted on the GPS!
EDIT
Oh, LOL, wait, you are actually trying to fly away from LECU and then straight back again…? I think that won’t work with such an LNM plan in MSFS because of the previously mentioned reason. If I am mistaken, please post what you are trying to achieve. 
Change your setting in LNM to only use MSFS data. By default it is set to use an old Navigraph AIRAC cycle.
Open LNM, top row click scenery library, then click Navigraph and choose the Do not use Navigraph database.
This is assuming you are using the latest beta and have loaded the MSFS scenery database under the same menu as above.
If you subscribe to Navigraph then you should download the beta from them that replaces the default navigation data with t he latest Navigraph cycle.
Ok so you are using userpoints in LNM, those will not show up in the sim planning. In order to get them in the sim you have to use the navigational waypoints denoted by the little pinkish triangles in LNM. My advice is to read the LNM manual on flight planning as it will not transfer 100% all aspects to MSFS.
You might be able to get more assistance at the LNP support forums too:
They do over here. I can drag the line anywhere I want to and hence create user waypoints and they all show up in MSFS.
As I said above, give it a try with two different airports, so land somewhere else, and see what happens.