With paths in woodland, surveying in winter is better than summer.

On my garmin, I switch gps to satellite view which gives an estimate accuracy figure. Start just outside woodland area. Stop walking, turn facing south and let signal stablise then waymark on best accuracy figure. Walk further 10m/strides whatever along path to be traced, then stop, turn south let signal stablise again then waymark, move another 10m/strides whatever, then stop etc, etc until path is completed. If at the same time you note where the signal is weakest you will know where your main problems are going to be.

For very bad signal spots if you can, walk 90 degrees to the path to a stronger signal point then waymark, turn around walk back across your path you are tracing, still at 90 degrees on the other side of the path at roughly the same distance then waymark again. Hopefully you path will be somewhere between the two waymarks.

If you think the above takes for ever, yes it does!

Another way is to stick a BT gps receiver on a very long pole :-)

>The OSM foundation can't make any profit.

Yes it can. It can't distribute those profits to its members. The profits can be used for other activities