Phenology: new presentation style

Perhaps folk who like to play with dots on maps would be interested in this novel phenology technique.
PPA_Neria cibaria
I call it fantail phenology. It can be constructed very simply using the same NBN Atlas downloads that you use for your GIS maps.
The instructions are in a spreadsheet at and I wrote a small piece on it in Dipterists Forum Bulletin and started a more substantial article
I would be interested to hear how you get on with it.