Strange attractor achievement

This achievement was proposed in the past, but has been rejected, because accidentally reaching a geohash which you have previously attempted whilst on a separate expedition is incredibly unlikely. In the rare case that this happens, a gratuitous ribbon would more than suffice. Please read the discussion page for more details.

As per the page proposed achievements: If an achievement has strong opposition and the reasons for opposition are not resolved through discussion, then the proposed achievements category is replaced with the rejected achievements category, the reason explained succinctly on the page, and the page otherwise marked to make sure it isn't confused with an achievements page.

Serendipitous retrohash achievement (perhaps)

Twice this year I have set out on an expedition and on the journey, unplanned and unintended, I finished up at an older hashpoint I had visited and I was NOT aiming for.

• Aiming for 2015-06-29 52 0 I reached 2012-08-08 52 0 - my track log showed me passing within two metres.
• Aiming for 2015-05-29 52 0 I reached 2012-11-04 52 0 - I missed my turning and my U turn was at the older point.

This is more than a Déjà vu achievement because it's not just any point, it's a hashpoint and it does not match the Déjà vu rules.

This is a retrohash but at a location with a preexisting report for an expedition making it tricky to document. It would be handy to have a ribbon template for this eventuality which added the appropriate categories and links without breaking the original expedition report. On the retrohash page, it should allow multiple ribbons with different dates and coordinates in case this happened more than once.

I'd suggest ...

• An approximate ten metre distance rule for this to count (a good story beats an exact measurement).
• You must not have planned or aimed for the retrohash. (If you did, it's just a normal retro expedition.)
• For hashpoints which, by chance, you'd pass almost every day, you can only claim the first one.
• You can only claim for your own expedition hashpoints, not every retrohash in history.
• You can claim if you reach a hashpoint which you failed to reach earlier. Perhaps the lake froze over so now you accidentally got there.

Possible ribbon wording ...

• Sourcerer earned the Strange attractor achievement by accidentally reaching 2012-08-08 52 0 while aiming for 2015-06-29 52 0.
• Sourcerer earned the Serendipitous retrohash achievement by accidentally reaching 2012-08-08 52 0 while aiming for 2015-06-29 52 0.

The ribbon should add these categories. Meanwhile they can be added to a normal expedition by editing the expedition page.

Category:Retro meetup‏‎
and either
Category:Retro coordinates reached‏‎
or
Category:Retro coordinates not reached‏‎