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I went to the marina after work today and tried the handheld GPS. Its least 
count is .001 min of lat and lon. That is about 2 metres in
lat, about 1.4 m in lon in the 40s of lat.

At the dock, the gps read charted position as close as can be plotted. The Lon 
ticked up one, down one occasionally, so between
1.4 and 3 m. The lat ticked only between two last digits. The altitude held at 
50-60 feet above sea level.

This is very close to what DGPS did at the same site, about 15 miles from the differential beacon.

The finger piers are about .011 min of lon apart, so I can tell which side of 
a slip I am in very easily. Readins in the cockpits of
adjacent boats never overlap.

This makes an anchor alarm really practical. If you set it as the anchor goes 
down, the radius can be barely bigger than the scope.

I expect that less settled weather will make it wander a little more. It is 
good enough now for most uses of loran, including returning
to a good fishing spot.


On Tue, 2 May 2000 16:33:47 -0400, Ed Kitchin wrote:

--Original Message Text---

With the reality that the government has now taken off "selective 
availability", does this mean that the DGPS is now an obsolete
piece of equipment? What kind of accuracy can one expect to be the norm now? 1 
- 5 meters? Does anyone know?

Ed



Rodney Myrvaagnes                   J36 Gjo/a
Senior Editor           Electronic Products
My oyster knife is Y2K compliant

   

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