I have no experience with the current
Raymarine MFDs, but that's never stopped me from offering advice.
This does sound like a software bug in e125. I assume this is an instantaneous error, that is, your ship's position changes for a single GPS
instant and then the correct position reports resume. The only reason you are aware of the probem is because you have tracks turned on and you see a long track from your position to the error location and back again. I've had a similar problem with my system with much older technology (C120, SeaTalk
The only thing I can offer is, if you use an external GPS
, to check all of your cable connections. You might put some RF protection on the power cables
for both the MFD and the GPS (if external). Since this happened overnight, it is unlikely that any onboard electronics
caused the problem, unless possibly if you leave an AIS
Class B transceiver active. Have you checked with other boats in your area to see if they've experienced a similar problem?
Other than those thoughts, I'd take the problem to Raymarine. Even if the problem cannot be fixed they may be able to provide a way to filter the GPS messages to eliminate position reports that are out of bounds.
FWIW, I never fixed my problem as it doesn't affect navigation
underway. I do use the tracks generated by OpenCPN
to capture and publish records of my passages on my website, and those anomalies did cause me problems. I wrote a small program to allow me to clean up the GPX track files, which was a lot easier than fixing the problem.