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This review is from: Navman MCX external antenna for iCN 5xx (Accessory)
The Navman MCX external antenna for my ICN 550 made a huge difference. I drive Peugeots which have a reflective windscreen causing problems finding satellites.The ICN 550 just couldn't work until I bought the external antenna. Now it starts working very quickly - quickly finding satellites. Unfortunately as good as the antenna is, the ICN 550's screen went into a washed out screen which spoiled my journey as the screen was unreadable.
Would I recommend the Antenna - absolutely.
Would I recommend Navman - not on my experience.