Project-GC Q&A - Recent questions tagged matrix81

Map of D/T grids per area

Tue, 02 Jun 2026 19:14:19 +0000

When I look at the tools already available under Statistics | General | Cache Stats, I see things like "Geocache types per area", "Geocache sizes per area", "FP per area", and "FP per D/T", but there is no such tool as "D/T per area".

I want to propose a new tool to visualize the number of complete D/T grids available in a specific area (country/region/county, depending on user's choice). It should be based not on finds of a particular user but on all active geocaches in that area. As a possible implementation, it could show a map in which regions are colored according to the maximal number of D/T matrices per country/region/county and showing the rarest D/T combinations for every country/region/county.

The practical use for such a tool would be, for example, to convince reviewers that enough caches exist in a given region to justify a D/T-matrix based challenge. If I want to publish a challenge to complete the D/T-matrix in a single county, seeing how many caches are available there for every D/T combination is currently impossible with the available tools. If this is implemented, one could also see in which regions a D/T matrix is possible to complete at all, and which specific combinations are missing.

At the moment I can do this for countries and regions by creating a Location filter in c:geo, but that works only for single D/T combinations, requiring a lot of manual work. It also doesn't work at all for counties because county is not included in the location field in c:geo.

'Way to 81' - what is the interval?

Sun, 24 Jul 2016 08:27:44 +0000

'Way to 81' table has a column "Interval". That is interval of what?

Changed D/T rating for cache - how to find the cache this was done for?

Sat, 17 Oct 2015 17:16:15 +0000

Is there a way to find which of the caches that I've found have had their D/T rating changed since I found them?

The reason for my question is that up until recently I had a full matrix. Now the owner of a cache that I had found has changed their D/T rating for the cache from 4.5/3 to something else. This left me with a hole in the matrix. I know that can easily be fixed by finding another cache with that rating, but that's beside my point. I'm just curious to find out which cache has changed their rating, and can't easily trace back which one that was. Especially as that cache has now obviously gone from the "Way to 81" list too, and I see no way to look up old "Way to 81" lists. Any suggestions are welcome.

'Way to 81' - why are some D/T in bold?

Tue, 14 Jul 2015 07:22:46 +0000

In my profile stats in 'Way to 81' section, some of the D/T are in bold but some not. Does the bold text signify anything?

I checked FAQs and also searched Q&A for 'bold' but not yet found anything, hence my question here... Sorry if it's been asked before and my search didn't find it.

Cheers!

Has anybody ever achieved a full 81 D/T grid with just FTFs?

Fri, 03 Jul 2015 04:48:04 +0000

Has anybody ever achieved a full 81 D/T grid with just FTFs?

And if not what is the closest somebody is to achieving this?

Is this a stat you can find anywhere on Project-GC? I know it is available for each individual but probably not as a ranking.