OCC Forums

Chartplotter anomalies

https://forum.oceancruisingclub.org/Topic5253.aspx

By DariaBlackwell - 30 Jun 2019

We've had strange patterns show up on our chartplotter from time to time. Today was extreme. I noticed that each time the wacky zig zag patterns happened, the DGPS was off and we had GPS only. Can anyone offer an explanation so we can understand what's going on?