Route cards are unfashionable and still the best planning tool

Everything here earned its place by changing an outcome. Nothing about route planning is included to round the number up.

The value is in the writing

A route card breaks the walk into legs, each with a distance, an ascent, a bearing and an estimated time. Filling it in reveals the sections you cannot actually describe, which are the sections you have not planned. This is why the exercise is useful even when the card itself is never consulted on the hill.

The group version matters as much, because a plan held only by whoever wrote it makes everybody else a passenger, and a party in which one person knows the route is a party with a single point of failure.

Timing formulae are a starting point

Naismith's rule and its variants estimate walking time from distance and ascent, and were calibrated on fit walkers on good ground. Adding time for descent, difficult terrain, poor visibility and load is what makes the number realistic. Comparing predicted against actual on a few known routes gives a personal correction factor worth more than any published rule.

The card also earns its keep during the day rather than before it, because writing down the real time at the end of each leg shows within two legs whether you are on plan, which is the earliest moment anything can usefully be changed.

Escape routes are the part people skip

For each leg, knowing where you would descend if weather or injury forced it converts a decision under pressure into a lookup. These need to be identified at planning time because they are hardest to find when needed.

A route with no escape from its middle third is a route that needs a better forecast. An escape also has to be an escape in the conditions of that particular day, because the obvious quick way off is frequently a steep gully that is straightforward on a dry afternoon and a serious proposition in snow or after heavy rain.

Leave it with someone

A rescue team searching for an overdue party works vastly faster with a route than without one. The person holding it needs to know when to raise the alarm and who to call, which is a two-sentence conversation. Telling them you are back is the other half, and is forgotten constantly.

Over a season, the person holding it needs the details written down rather than remembered: the time at which they should act, the number to call in the country you are actually in, and the registration of your vehicle and where it is parked.

Digital versions work too

A shared route file or a message with the plan achieves the same thing and is easier. The failure mode is a plan stored only on the phone that went into the river with you.

Whatever the format, the copy that matters is the one somebody else has. Satellite messengers and tracking beacons add a great deal and replace none of it, because a live track shows where you have been rather than what you intended, and a team searching a mountain gains far more from knowing where you were going.

That varies by region, and it is worth checking locally.

Write down what would change the plan

A plan is built on an assumed forecast, so the thing worth recording alongside the legs is the conditions it depends on: the freezing level, the wind speed on the ridge, the cloud base and the state of the river. That turns a vague feeling that the weather looks worse into something checkable — the freezing level is four hundred metres lower than planned, therefore the summit ridge is out and the valley alternative is in. A turnaround time written next to a specific leg does the same job for daylight, and it works precisely because it was set by somebody who was not yet tired, cold and two hours behind.

What this guards against is the ordinary human tendency to carry on with a plan that has stopped fitting the day, which recurs in incident reports far more often than any equipment failure.

Everything above, in order of what to do first

1. The value is in the writing. A route card breaks the walk into legs, each with a distance, an ascent, a bearing and an estimated time.
2. Timing formulae are a starting point. Naismith's rule and its variants estimate walking time from distance and ascent, and were calibrated on fit walkers on good ground.
3. Escape routes are the part people skip. For each leg, knowing where you would descend if weather or injury forced it converts a decision under pressure into a lookup.
4. Leave it with someone. A rescue team searching for an overdue party works vastly faster with a route than without one.
5. Digital versions work too. A shared route file or a message with the plan achieves the same thing and is easier.
6. Write down what would change the plan. A plan is built on an assumed forecast, so the thing worth recording alongside the legs is the conditions it depends on: the freezing level, the wind speed on the ridge, the cloud base and the state of the river.

The takeaway

Write the legs down. The ones you cannot describe are the ones you have not planned.

What holds up over a week outdoors is rarely what looks best at the trailhead.