Making an entity go to a location

I am trying to spawn an entity and making it go to a certain location.

I have searched all over the internet, and I found so many different solutions...

• Vectors
• Navigation.a(double x, double y, double z, double speed)
• PathfinderGoal

But they don't work, because with vectors it just launches the entity forward, which is not what I want.
The navigation way:

Code:java

EntityInsentient entityIns = (EntityInsentient)((CraftEntity)cow).getHandle();
                    entityIns.getNavigation().a(loc.getX(), loc.getY(), loc.getZ(), 0.3f); 

Doesn't work at all, it just spawns the entity and it doesn't move until I hit it.
And I have absolutly no idea how to use the PathfinderGoal thingy.

Please help! How can I make an entity go to a location?

Thanks in advance!