Transcribing features from old USGS topo maps to Navionics card

[Tonykarter]

I recently found some old Topo maps that have been digitized. USGS topo maps from before the impoundment of most man-made lakes, some going back to 1884, but most since 1940. How could I transfer features I want from these to my Navionics map? I'd like to transfer some old road beds, home sites, bridges, etc that are now inundated. Navionics has some of them on it, but they have only scratched the surface of what was there before the lakes were flooded. I have Easy GPS Pro, but have only scratched the surface of its capabilities. Not sure if that would help. Being able to transfer these to a Nav card would make on heck of a structure fishing tool. Thanks in advance.

[Kirth]

Nope cant be done. You can always send a request to Navionics and ask them http://navionics.force.com/PlugPlay

[TurboDan]

You and I are thinking the same thing. I have found same type maps for my local lake. They show the GPS type coordinates on map. My next step is to import into my CAD program and overlay matching grid over map. Hope to get enough resolution to manually enter coordinates using Humminbird PC. Will see how this goes...

-danny

[Tonykarter]

I would like if I could put my cursor on an old house site or culvert and it show me the lat/lon as can be done on google maps. I can manually enter the coordinate into my gps to place on the navionics map. Still better, I'd like to be able to draw a line along an old roadbed and convert that into a plotter trail, then put it in the navionics map as an old roadbed. Putting it into navionics is not the issue, the issue is getting the info off of the old topo in a digital form, in an accurate approximation of lat/lon to create a waypoint, or a stream of data that forms a plotter trail: that is the problem.

[Dirtdobberusa]

Just a little input. What you are trying to do can be done. It will require using GIS software such as Arc-map and geo-correcting the old maps. The old maps especially old aerial photo's have enough distortion in them to only get you in the ball park as far we expect from our technology. Once this is done you can pull the coordinates from the gis software and I am sure with a little rangling get them so they can be downloaded into your plotter.