Response from OP
I just clicked on the first two links. The prior contributor shared those prompting my wanting to share a bit more information as the OP.
If you click on the latter of the two links he shares, you will see an item at Amazon called the Glo 2 Glonass. I had previously failed to share that I bought one of these. I’ve used it once, but just as a way to get an Internet signal to an alternate iPad. We have one that does not have cellular, and I wanted to run Aqua Map’s on one unit and Navionics on the other. We did that once, and it met that need, but subsequent to that I learned from another boater these Canadian waters shown on Aqua Map’s lack detail available through Aqua Maps in the states. Those mostly have to do with available data regarding deaths and how updated that information is. In Canada I understand, you can basically just see the chart as a nautical chart looks. The one time we used it in that manner we were not getting this intermittently failing signal so I could neither evaluate an older iPad with a external GPS against my newer iPad with cellular and GPS, nor aqua maps versus Navionics.
It’s not the ideal approach, but if my experiment with our friend's taking the iPad of ours, which has already been determined to be on the exact same settings, and the exact same model as theirs, on their boat, and If that iPad doesn’t have the issue while with them, it points to some type of interference from something on our boat, which I mentioned yesterday as maybe the culprit. Then in addition to increasing my use of current paper charts and fix and dead reckoning there, I will just use Aqua Maps as opposed to Navionics. Old aqua, Mabs charts aren’t ideal, but rocks don’t move. Certainly, however, channel markers might so heightened awareness is necessary.
I will be shocked if my iPad misbehaves on their boat and here’s why. When it happens on ours, it happens on all of our devices. We have the program running on all at the same time. And that has me thinking there’s more credence to my concern about electronic interference from other devices on our boat. If the friend boat iPad experiment goes as I suspect, my next step will be to run for a while without the autopilot on and assess. If the problem still exists, I turn it back on and run the chart plotter. If it STILL exists, then, I turn both off and see.
At that point if nothing is clear maybe I buy an RV?!
Do we agree that if a breaker is off to either an autopilot or a chart plotter, Theo’s no way it’s trying to triangulate?