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Originally Posted by Sudesh
When he connected the NAV he plugged in a blue plug and a red plug and that was it,didnt see and antenna wire?
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That's why its not working: no GPS antenna connected.
If he upgraded from Mk2 to Mk3, then he needs to unplug the antenna wire from the old, external, GPS receiver, and connect it to the new Mk3 nav unit. The Mk3 has the GPS received built in.
The old (external) GPS receiver is no longer required, it can be unplugged and removed, and sold on eBay :-).
Even if you don't remove it, you should unplug it.