We're using auto-land today, please turn off all electronics
Landing into ICN this morning it was a bit foggy, not super foggy (I've landed in JFK in far worse) but foggy nonetheless. On approach the captain announced that they were going to be using auto-land and accordingly everyone had to turn off all electronic devices no matter the size. Of course I complied but it got me thinking about why such a request might be made? Do such devices really disrupt auto-landing systems substantially more the "normal" ones or is something along the lines of the mobile phone at the petrol station forecourt, i.e. no real evidence just a surfeit of caution?