ETA errors on navagation

Philip2

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8
Genesis Model Type
Genesis G80
Have been using my on board navigation during my business trips which have to pass through Los Angeles. I know from experience the arrival time it gives me is way off. As I drive closer to my destination it eventually corrects but this is usually in the last 30 minutes of a 3 to 4 Hour drive. My portable Garmin, I used to use in my previous car never did this. When I simultaneously punch in these addresses on my Garmin and inboard navigation, the Garmin will initially give me a probably correct ETA, which is usually 50 minutes later than the inboard ETA. I would assume my inboard navigation is just dividing the distance by estimated speed where the Garmin is actually figuring in the almost daily traffic jams through Los Angeles.

I have Sirius, so it should be figuring in traffic flow.
Can you explain this? Am I doing something wrong or is my navigation system not getting traffic for some reason?
 

Mcc

Supporting Member
SUPPORTING MEMBER
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Los Angeles
Genesis Model Type
Genesis G90
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