as a bit of a side project, i have been playing with the idea of using OpenCPN (for Raspberry Pi) on my boat. i will generally be using it on large inland lakes in this area, but have found no charts. through my research, i was looking for maps for OpenCPN, i came across Open Sea Maps plugins for Java Open Street Maps editor. maybe i am going the wrong route, hence my struggle.
all i need is some sort of chart of inland lakes. my intent is to use the plotter while fishing. depthcharts would be great, but i would be happy with just a topographical map. i tried GE2KAP, but i wasn't impressed with the detail. i would need to make a lot of little zoomed-in chart files to get any detail.
How about making Kap files using one of the plugins? They would not have depths however. Have you tried using the Chartdownloader to download the Maine Charts?
Perhaps some of the larger lakes connected to the ocean are covered.
I just checked, and it only does Kennebec. I think it is creating Kap files.
I spent most of two days trying to figure it out and couldn't. I tried, iirc, three different toolchains. Let me know if you get it to work. KAP isn't a widely used format, and I was unable to find any open-source tools that are currently being maintained that can manipulate them.
ok, fixed the issue above. now i have it, though i will have to cruise the lake when my boat is finished to check accuracy. it looks a little distorted, but maybe it is correct. i will make a chart for my house location, and see if the chart matches my handheld GPS location (i will use it for the NMEA data, so it will be plotting from the same GPS data).