British Orienteering rules [applicable to any level of event] wrote:24 Control codes
24.1 The control code must be clearly displayed near the control banner and visible from the punching station.
24.2 The numbers or letters must be black, between 3 and 10 cm in height and have a line thickness of 3 to 10 mm.
I believe there isn't space for the number visible on the older larger BSF7 SPORTident boxes to be at least 3cm tall, without obscuring the SI Card hole or the flashing light or larger numbers being too wide for the box. E.g. "Arial Narrow" at 120pt is about 30mm tall and "254" would be 56mm wide. It definitely isn't possible on the newer smaller BSF8 boxes. See https://www.sportident.co.uk/equipment/ ... y.php?id=3 if you don't know which box is which. And SPORTident's numbers definitely don't meet this rule: https://www.sportident.co.uk/equipment/ ... .php?id=20 (the label is 32mm * 41mm so the number is surely smaller than 30mm tall).
I believe that means you ought to have a separate plate with the number on, e.g. vertical affixed to the cane. But very few events do this, including up to some level B events. And not unsurprising, since fiddling with codes on plates on the canes is a pain for the planner.
What do clubs do about this? Does everyone just ignore the rule? If so should the rule be changed, or at least have some variance in minimum size for level of event?