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    Thank you. All done. It was eventually a waste of time as GPSBabel wasn't able load such a large file, and even if it did, apparently I would have to scroll down the 3.7 million postcodes as the "Favourites" page on the Garmin does not allow search. Back to square 1... Commented Sep 30, 2024 at 17:38
  • @user256787 ok, all done. But what tool did you use? Commented Sep 30, 2024 at 21:02
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    I uses the awk answer awk 'BEGIN{FS=OFS=","} {sub(/ +$/,"")} NR==1{gsub(/ /,FS)} NR>1{$1="\""$1"\""} {print $2, $3, $1}' pc0.csv > pc1.csv Commented Oct 1, 2024 at 23:44