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jn1 said..
Plus, I don't think the GW60's antenna is very high gain, and I'm guessing this unit has very low processing gain. Plus, it's on the wrist, and its antenna could be facing the water on a given tack.
The GW60 antenna is also directional. So when it is facing the sky it has very good reception. When tested in controlled conditions against the GW-52 and the Motion, it was very excellent. But the wrist wearing does degrade it performance. Sometimes it is still excellent, but at other times it can be not so good, depending on the conditions and how it is orientated. When worn facing the sky properly in a bicep bag, it can perform very well.