I hate technology (namly GPS)
Hi all don't know if anyone can explain this. Was running a night exercise Sunday night around Plymouth (yes it was windy). 4 GPS's of different varieties. Plotted some waypoints on the chart. (Datum wgs84) entered into 2 gps's one garman 12 and one Magellan 115 and went out on the water. They were completely up the spout one was claiming that the Yelm was 2 miles up the Tamar!! tried going to positions that I know are correct and have used hundreds of times and these were out by miles two. We had good strong satellite fixes and the units were saying that their was a good accuracy. I swiched one to datum wgs72 as it is very nearly the same as wgs84 (the difference is altitude) and this started to work. Then the all worked going south and not north. and then they all started working propoly. This is very strange as we checked the health of the system and every thing was ok.
anyone got any ideas?