We have a GB 32 with about 120 gal fresh water. We have no trouble going over a week and taking at least 6 showers and still have a quarter of a tank left. I suggest that you practice much more water conservation
Get them on Amazon very inexpensive. Think I got over a dozen for under $20. You have to make sure that you get a base with one or 2 contacts depending on what kind of socket you have. Most likely they are 2 contacts so that the polarity is fixed.
Yes, it was pre Garmin. But I have had pretty good service from Garmin also. Particularly when I wanted to something with the chart plotter and “knew” there must be away but couldn’t figure it out. They have always come to the rescue!
I had a Vesper Xb -8000 which I installed myself. I had a problem ( which I caused myself) while sailing in Maine and they called me from New Zealand. Got me on line again. Outstanding service!
Navionics on IPad
I have been using Navionics on my iPad Air for 2 years. It works great. I don’t know what you mean by auto navigate. It does work with auto route generation. And I can then send the route to my Garmin chart plotter via active captain and the the chart plotter runs the auto pilot