Glad you got it worked out. Terrain Awareness needs to have a defined flight path and a location to look data up for. When you are not connected to your aircraft and you are not on a GPS enabled device it will default to 0,0 latitude and longitude which is in the water. I guess that is a bit of a weirdness when you don't have a path planned. We will look into checking for that first before throwing the terrain data availability warning.