Holy shit. Your drain tubes are clogged up dude. You need to try and blow them out with air. Then pour water into each drain tube, and see if it comes out the bottom, or trunk. If water still gets in the trunk, you need to investigate more. Like spray water at windows, then trunk, then sunroof. See where it's coming from. You might have to take down the headliner as the tubes might be detached. For the time being, drill a few tiny holes in the low spots in the trunk. At least get the water moving out if it gets in. Make sure you paint any exposed metal with something like POR15 to protect from corrosion.

Yes, the water can take your nav out. On the pass side, in the trunk look for where the power wires go. You will see one go in the area of the spare, but maybe higher up. It looks like a closed plastic box. Once you open that up, there are more fuses in there. Check that.

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2006 4.8is, Black on White. SOLD Sniff Sniff.

2017 F85 x5m, Black on Red. BEAST MODE


"The older we grow the greater becomes our wonder at how much ignorance one can contain without bursting one's clothes." - Mark Twain

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