Spotting

[Hobbes]

Hi folks, can anyone confirm the spotting rules for me?

I think if an enemy unit with LOS is destroyed your position will be lost to the enemy next turn if no other enemy unit has LOS?

If an enemy unit with LOS is forced to retreat out of LOS your position will NOT be lost to the enemy next turn even if no other enemy unit has LOS?

Maybe this is true just for the next turns artillery bombardment?
But sometimes it seems true for full LOS for all enemy units next turn.
Thanks, Chris