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  #1  
Old 07-04-2005
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Standard Horizon CP160

I am having a problem with my CP160 Chart Plotter. For some reason when it''s in active tracking chart mode, the position it has me at on the chart is different from my actual position. Sometimes itís off up to 80-100 yards. I can only assume that it needs to be re-calibrated or some parameter has been changed. There is no manual correction entered and the error changes depending on COG? Does anyone have any ideas or where to start looking? The CP160 has been discontinued by S-H

Mike T
E-29
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Old 07-04-2005
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Standard Horizon CP160

I don''t know anything about the CP160, but the error you describe could be due to a mismatch of datums between the chart and your GPS position. Check what datum the chart was produced with (could it be the older NAD27?), and check the datum setting for your GPS receiver (typical default setting is WGS84).

See http://www.sailnet.com/collections/articles/index.cfm?articleid=sexton046 for one discussion of datum.

Regards,

Tim
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