I'm like mountainvan, I just use a sheet if paper to sketch. It shows (not to scale) the tank, the conductor lines and the mains. The laterals are not on it. All valves are indicated, all sap ladders and the tap count on each line.
Not on the map, but on the saddles, I bought some plastic tags that I hang at each saddle with a count of taps on that lateral like these: https://www.amazon.com/dp/B00JVBMQ5Q...a-307689047973
I don't remember who I ordered them from, but those are similar. When I ordered I just searched the web for the best price and ordered. I use a permanent marker to write on them. If I notice a lateral has too many, this helps me decide which to make into 2 lines. (I have both 5/16 laterals with 3-7 taps and 3/16 lines with 14-42 taps, that 42 is going to be made into 2 lines this year)
When I make a sketch in the field, I designate the mains by a letter. Then at home I redraw it neater, and then I copy it and make a few copies. I then laminate a copy or 2 to be used in the field
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.