Simpler options that have helped me:

1) Carry a spare LED light; clip to hammock before leaving site.

2)Hang a reflective (emergency) blanket below hammock. Once a flashlight hits it, the hammock is highly visible.

3)Hang white laundry, hankerchief, bandana, etc., from some line (even hammock suspension). My flashlight turns that into a beacon, as well.

CM