NRTR Indicator MT4

NRTR is a free, instant-download MT4 overlay that plots a self-adjusting trailing stop-and-reverse line directly on the price chart, flipping from support to resistance the moment price breaks the trail. This is a straightforward MT4 conversion of the classic Nick Rypock Trailing Reversal concept, built around just two inputs, so it’s easy to drop on any chart and see immediately what it’s doing.

What NRTR Actually Calculates

The indicator uses two buffers: value1 (blue arrows, labeled “NRTRUp”) plotted during uptrends, and value2 (red arrows, labeled “NRTRDown”) plotted during downtrends. Both are drawn with DRAW_ARROW using arrow code 159, which renders as a small dot that traces along the trend.

Step 1 — Average Range

On every calculation pass, the code sums |High[i] - Low[i]| for the last AveragePeriod closed bars (default 10) and divides by that period to get an average bar range, AvgRange.

Step 2 — The Distance Factor (dK)

That average range becomes the trailing distance, dK = AvgRange / AveragePeriod. There’s one quirk worth knowing: for USDJPY, GBPJPY, and EURJPY, the code divides dK by an additional 100, a hard-coded adjustment for the different pip scale of yen pairs. If you run this on a yen cross, the trail will sit proportionally closer to price than it would on a non-JPY pair with an identical average range.

Step 3 — The Recursive Trail

Starting from the oldest bar in the calculation window and walking forward to the current bar, the code tracks a running extreme price — the highest close since the last flip in an uptrend, or the lowest close since the last flip in a downtrend — and computes a trigger level of price * (1 - dK) (uptrend) or price * (1 + dK) (downtrend). When Close crosses that trigger, the trend flips, the extreme price resets to the current Close, and the opposite buffer takes over.

How to Read and Trade It

• Blue dots trailing below/near price = the indicator considers the market to be in an uptrend, with the dots acting as a visual trailing stop/support level.
• Red dots trailing above/near price = downtrend, dots acting as trailing resistance/stop.
• A flip from blue to red (or vice versa) is the reversal signal — it’s the moment Close broke through the trigger level described above.

Most traders use NRTR either as a visual trailing-stop reference for an existing trend trade, or as a standalone stop-and-reverse system, entering in the direction of whichever color is currently printing.

A Practical Note on Chart Load

Because the entire recursion runs across the full CountBars window every single tick rather than stepping forward incrementally, applying NRTR with a large CountBars value on a chart with a long history means the terminal re-walks that whole recursive sequence from scratch each time a new price update arrives. On lower timeframes with fast tick flow, this can be noticeably heavier on CPU than indicators that only touch the newest bar. It’s rarely a problem at the default of 300 bars, but worth knowing if you push the setting much higher.

Input Parameters

• AveragePeriod (default 10) — number of recent closed bars used to compute the average range that drives the trailing distance (dK).
• CountBars (default 300) — how many historical bars the indicator recalculates and displays; automatically capped down to the number of bars actually available on the chart.

Repaint Behavior

NRTR repaints. The entire recursive trail — from the oldest bar in the CountBars window down to the current bar — is recalculated from scratch on every single tick, using whatever dK value the most recent 10-bar average range produces at that moment. Because dK shifts slightly every time a new bar closes, and the trend-flip logic is a sequential recursion that depends entirely on that value, a small change in dK can move the trigger levels enough to flip the recorded trend at a different bar than before. In practice this means dots you saw plotted an hour ago can silently reposition or change color once more price data arrives — the defining behavior of a repainting indicator.

Limitations

• Because it repaints, NRTR is not reliable for strict backtesting or for any strategy that needs its historical signal positions to stay fixed once printed.
• The full history within CountBars is recomputed on every tick rather than incrementally, which is heavier on terminal resources than modern MT4 indicators that use IndicatorCounted() to only process new bars.
• The JPY-pair scaling adjustment is hard-coded to three specific symbols (USDJPY, GBPJPY, EURJPY); other JPY crosses (e.g., AUDJPY, CHFJPY) do not receive the adjustment.
• There is no alert or sound notification built in — trend flips must be watched visually.