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NavyShooter said:As a navigation systems guy (W Eng SONAR background - we fix nav gear too) this article has given me cause to consider whether or not there were 'other factors' at play as well:
Additionally, knowing how our GPS and other systems have performed in Vestfjorden once upon a time (I was summoned to the bridge by the NAVO 'at the double' because our ship's course/track on the SHINNADS system was not a line, it was a square-tooth wave pattern) I would be curious to see what the chart notes indicate about GPS performance in the area.
Our 'squaretooth track' was caused by interference from a large overhead high-voltage power cable that passed OVER the Fjord - and due to the angles/elevations of the mountains, we were not getting good satellite coverage anyhow. I read the chart notes - showed it to the NAVO, and he learned...
And both are common problems ... the first, RF interference from non-traditional or unanticipated sources, is increasing as infrastructure develops everywhere, and the second, the limitations of satellite services in Northern (and Southern) latitudes, is well known (and taught) but is, unsurprisingly, sometimes a surprise to individual users who encounter it for the first time.