We use a color-coded system, much like our Homeland Security Warning System colors: white for 25', eggshell for 50', ecru for 75', bone for 100', very light beige for 125', cloud for 150', ivory for 175', oyster for 200'. In between those marks, I have carefully etched small cuts in the rode every 3" and just count out those marks as they spin out of the windlass (um, that's 19, carry the 2, oh look - there's an eagle!). The nice thing about the cuts in the rode is they don't fade with time... in fact, they tend to spread and the entire rode begins to look like a wooly caterpillar... it's at its fullest right before the rode scatters in little pieces like a dry dandelion in the wind. Pretty!
Kidding aside, permanent (sorta) marker on the line, yellow rescue tape on the chain for us. 25' increments.
Best wishes,
Jim B.