15 de marzo de 2025
Notes From a Recent Planning Session
A concrete post with a clear subject and real-world context.
Last week we sat down with a local orienteering club to review their upcoming season. The main topic was the set of plastic coordinate cards they use during competitions. These cards, printed on rigid PETG sheets, have to survive rain, mud, and being stuffed into a pocket for hours. The club had noticed that after two seasons the ink started to fade along the fold lines, and the edges began to peel.
We spent the session going over material thickness, lamination methods, and the type of ink that bonds best with polyester-based plastics. One of the members brought a card that had been submerged in a stream for about twenty minutes during a control check. The print was still legible, but the corners had softened. That gave us a clear benchmark: a card needs to hold up under full immersion for at least thirty minutes without losing readability.
We also discussed the grid layout. Most of the club's maps use a 1:15,000 scale with 25-meter contour intervals. The cards they carry list key waypoints and bearing lines. The problem is that the current design places the coordinate grid too close to the edge, so when the card is trimmed, the outer cells get cut off. We proposed shifting the grid 8 mm inward and adding a 3 mm bleed zone for the background color. That way, even if the cutting is off by a millimeter, no data is lost.
The next step is to produce a small batch of ten cards with the revised layout and test them during a training session in the Sierra de Guadarrama. The club will run the cards through a full day of navigation, including a river crossing and a section of dense scrub. We will check the cards afterward for ink wear, edge curling, and any tearing around the hole punch. If the results are good, the design will go into production for the rest of the season.
This session was useful because it moved the discussion from general ideas to specific constraints: material thickness, ink type, grid placement, and real exposure time. The club now has a clear set of requirements to hand to their supplier, and we have a better understanding of what a durable coordinate card actually needs.