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windsurftom said..
Can someone not just copy them... They haven't been surpassed.
There is not doubt that the GT-31 was a revolutionary GPS for our purposes, but it was far from perfect.
The biggest complaint was lack of waterproofness. They must be used in a reliable waterproof bag. Many were drowned when bags leaked. Another comlaint was incidences of units 'freezing' and having to be run flat over many days.
Many complained that they were too hard to 'set up'.
The 5Hz GW-52 does supass the GT-31 for accuracy, and so does the GW-60 in most circumstances.
The GW-60 addressed the biggest complaint being the only one of the three that is 'Waterproof'. It also addressed the clamouring from forums to make it a watch. In this case, people got what they asked for.