If you want the rules to create the Sentinal index, something I worked hours a day for weeks to come up with in a useable format, then here you go Any time frame (30 minutes used in the system), take the close of the current candle and subtract the close from the previous candle from it. That gives you a number that shows which direction (up if the number is positive, down if the number is negative) the pair has moved in the last two 30 minute candles. Now, do that for all 7 USD based pairs for the same candle (if you subtract the close on candle 8:30 from the close on candle 8:00 for Jan 8th, 2006 GBP, then you must subtract the close on candle 8:30 from the close on candle 8:00 for Jan 8th, 2006 for the other 6 pairs). Add all the numbers together, divide by 7 (to come up with an average USD move) and that gives you a number....logistically the total average amount all the USD based pairs have moved. Now chart it. Take a base number, doesn't matter what it is...I use 1000. For each 30 minute candle you do the above rules for (and come up with your sentinal number for every 30 minutes), add this to your base number. If your first calculation gives you +8.24 (the number you get after you add all the movements together and divide by 7), add it to your base number 1000 to get 1008.24. Plot that on your graph. The second calculation (next 30 minute candle) gives you a movement of -3.12...then add that to your previous sentinal number which becomes 1005.12. You see? Thats a sentinal number. If you'd like to wait a few days, I can definately get you my hand generated numbers. Until then, if somebody comes up with an automated way of producing this on a chart, then I'd love to see it. It would save me much work -Kev Savage Pip Fiend