http://www.cgeo.org/ is a phone app (Android) that lets you save cache data to your phone, so you don't need data to go geocaching, since you can download the caches you want to look for over wifi ahead of time.
It's never been easier!
If you're on Android download an app called C:Geo(there are others, but that's my personal preference). If you're on Apple,I think your only option is the official app unfortunately (it's a great app, but it's not entirely free). If you don't have a smart phone, go to the geocaching website and find some on the map near where you live, write down their coordinates, and punch them into a GPS device (that's how I used to do it. It's a pain but I believe it's more accurate).
That's pretty much it. There's probably a lot in your local parks and on trails near you. There's also a lot in cities that are very cleverly hidden. You navigate to the location, find a hidden container, and sign the log. If it has prizes inside, feel free to take one so long as you put another prize in its place.
If you get really into it, make an account on the website and start hiding your own!
hah, yeah.. I find the constant data is what does me in. I had a sudden need when I was in an area where I didn't have data coverage, and I couldn't find anything in context of landmarks. Downloaded the offline maps from http://www.cgeo.org/faq.html#osm-howto at a local Tim Hortons, and off I went.
I create my GPX files with GSAK, and load them on my phone via Dropbox. The import functionality is quite good - a file in Dropbox can be opened with c:geo, and it prompts to create a list.
c:geo gives you the functionality to "one click log offline" - found it, didn't find it, etc.. when you're back in connectivity-land, you just go through and properly log your finds.
Offline maps and caches is the reason I'm not using the official app.
/u/lampworker linked to a good write-up on doing this.
streetcomplete een app die het makkelijk maakt om aan osm te kunnen bijdragen.
No, it's not: http://www.cgeo.org/faq.html#why-no-api
And this is one of the reasons why c:geo is better than cachly. It gives you the same access as using the website (which is exactly what it's doing under the hood) , while API-based cachly is still limited to 3 caches per day (among few other things).
From the FAQ:
How to let the map rotate in walking direction?
At the moment c:geo is using versions of Google Maps and Mapsforge which do not support map rotation but are always northbound.
We are however working on implementing newer versions of both map types which will also support rotating maps in one of the future versions of c:geo. As this requires a rework of the complete map implementation it will take some time to be developed.
This is my mentality exactly. A few years ago, I sold my Garmin Nuvi and started using my smart phone.
I noticed that c:geo was mentioned. I also use Locus Pro which is awesome for Geocaching but also does pretty much anything you'd ever think to do with a GPS. I use Locus Pro because I can download maps and then use them offline for when I'm caching in places with low or no reception. c:geo is super simple and only for Geocaching. Locus Pro is good for Geocaching, saving caches offline, topo maps, hiking, biking, driving, marking the location of your parking spot, placing caches (with caching tools), recording tracks... basically anything a dedicated GPS would do and more.
EDIT: Just a note, I've heard a lot of cachers complain about the official Geocaching app. I have not used it because of this.
I used the free app when I had an iPhone, until I got a dedicated GPS.
But now that I'm on Android, I much prefer the (also free) app C:geo when I'm not using my Garmin.
Locus didn't seem to understand the Osmand maps that I had downloaded.. it knew that I had map files, but wasn't able to read them. Wondering if they're compressed somehow, and it might be easy to fix.
However, Locus could read and use the Mapsforge maps (linked to from http://www.cgeo.org/faq.html#osm-get-maps) that I use with c:geo.
It launches August 8th. Here's the page for the opening ceremonies. This one appears to be one where you have to get the caches that day or fairly quickly to get the prize. But the geocaches will likely stay up for quite some time to help share the history of Spokane and it will likely be listed at the link in my last comment. If you'v never been caching before, this would be a cool way to start, Cache Advance is giving a free geocaching 101 class and that will get you started quite easily.
I found out about the GeoTour on this weeks episode of Caching in the Northwest where they were talking with one of the people who helps with the BC Gold Country GeoTour.
Not sure whether this applies to you or not, but all you need to get started Geocaching is a smartphone with GPS capabilities and a Geocaching app. I recommend c:geo for Android, but haven't got a clue for iOS. You can also do it with a handheld GPS Reciever (like hunters or fishermen use) and cache info from geocaching.com
i've used this before, http://www.cgeo.org/send2cgeo.html
i don't think it's the same that you're asking about, but it reminded me of it. maybe you would like to check it out if you're using c:geo and can't get the other to work.
edit: i just looked at the button. i'm going to test it with groundspeak android app and report back.
edit2: i don't think it works that easy. it basically tells you if you want to find a cache with your phone open the app and put in the GC number... unless you are a Trimble user.