[PUP] Lady Anne (W40) Hits Rock In Glacier Bay

[Mike Maurice]

Jeff Siegel's Active Captain and charts shows the position the boat's 
GPS shows where it struck and the location where the rock is as almost 
indistinguishable. The chart scale is 80K to one.

In other words, 2 waypoints; one each at the rock and the boats position 
overlap such that at 100 percent zoom you can barely tell them to be two 
separate waypoints.


The difference is about 100 feet north and 30 feet west.

The only way to get the dots to separate is to over zoom.

The scale of the chart is simply to small to support such chart 
plotting, whether using or not using the GPS.

It would take a chart scale of about 10K or less to support such close 
proximity approach and using the GPS.

In other words, the chart is not of such detail to be used to fix the 
rocks position within about 100 feet. And even though we now have the 
exact position accurate to within??? 10 feet or so, the chart won't 
support plotting it to that accuracy.


Mike

_________________________
Capt. Mike Maurice
Tigard, Oregon (Near Portland).