Re: Which Chartplotter do you own?
I use a Garmin GPSMAP168 Sounder chart plotter.
I am on the St. Lawrence River and I find that the base map is off, it shows me to be about 1/4 mile further south than I am. As an example if I'm on one of the islands in Canadian water it will show me as south of the US/CAN border. I've had numerous e-mail communication with Garmin and they can't seem to give me an answer. I've updated the software this winter so I'll see how it is this spring.
The Garmin support tech has asked me to take a picture of the screen showing the lats/longs and the base map showing where I am....but he said that probably won't give him any indication as to why, but he can show it to all the other techs and maybe someone will have seen it before...
Sorry about rambling but it pi$$e$ me off !!!!!