For AI Units:
landing on a FARP I get event ID4 by setting waypoint to land.
landing on Ground with "Perform Task", "Land" gives also event ID4.
Next to check for players.
You have to check if your OvGME path is the same that Admiral is using.
Admiral is using following path:
\HMS Albion_Support Craft\Save Games\DCS.openbeta\mods\tech
If it doesn't fit to yours, you have to adjust.
navpoints are waypoints, also IPs. In some modules it is possible to import waypoints en mass. For some Maps I created list with such waypoints. An easy way to bring such points in the mission editor to plan flights is highly appreciated.
Think the real problem is that we wait now several years on the Data Cartridge and mission planning system promised by ED. And above solution was a hack from RB to give us players a solution.