[archwerks]

It dawns on me after reading everyones' comment about variations in the time it takes for idrive to set up, that depending on what priority the Navigation sys has within idrive, the Nav sys is also subject to GPS signal acquisition based on the car's (receiver) location because GPS emits microwaves, which may be blocked by concrete buildings/underground pkg etc. much like dropped cellphone calls.
As cars become more dependent on computer electronics, they're just like the F117 bomber, which for $1 billion + per plane, cannot fly without computers!