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I read an article in a magazine or online about a (.gov, I think) site which showed two, four to six character sequences in a mobile phone browser window. The letters from left to right indicated lower to higher precision positioning. As precision decreased, the characters on the right turned red, indicating a best guess accuracy.

There wasn't an app to install. It was a web page where you would visit it once while on 4G/WiFi, let it download some data to your phone (I think it was an HTML5 web app), then it could be used offline, so long as you had a GPS signal.

I'm going on a trip soon and I'd like to use this app, but I forget what the website was. I saw it within the last year. Does anyone have any clue what the site could be? It could have used maidenhead or MGRS, but I'm not 100% sure.

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    $\begingroup$ So, your question is "what website did I see, but can't remember?" -- or is your question "I like to know if there is an app which can display the maidenhead locator on my mobile phone?" -- if the later then please specify what mobile phone you are using. $\endgroup$ – Edwin van Mierlo Aug 15 '16 at 13:06
  • $\begingroup$ The former. I was curious to see if anyone else has come across the same site. $\endgroup$ – user38537 Aug 15 '16 at 13:58
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    $\begingroup$ OK, I am out, I seriously do not know what you don't know nor can remember :-) $\endgroup$ – Edwin van Mierlo Aug 16 '16 at 7:06
  • $\begingroup$ Yeah I figured it was a long shot. Thank you though. $\endgroup$ – user38537 Aug 16 '16 at 12:44
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I do a lot of off-network travel and one thing I found out is that you can cache Google Maps as described on this link.

Then your Google Maps app will keep running as long as you have GPS (and if you don't you likely have bigger problems).

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