Since you are going to be locating your caches by GPS locationing, you need to consider what sort of equipment and software you need.
Handheld GPS Device
Despite the advent of GPS locationing in smartphones, many people still prefer the functionality and versatility of a dedicated GPS device. There are a number of companies that produce such devices. One of the more popular brands is Garmin, and the illustration shows a Garmin eTrex. These devices are easy to interface with your PC via USB, and then you can copy either .gpx or .loc files directly across to the device, as if it was a USB storage stick. Also, you could use the Garmin eTrex along with the EasyGPS software below.
Some people like to use software to manage their location files. There are 2 sorts of files, both of which are supported on this site. The .loc files give only locations. The .gpx files give sufficient information for mapping purposes. Many advanced mapping softwares will read the .gpx files, and can be used to provide routes and itineraries. One piece of free software that you might consider using on a Windows platform is EasyGPS. The screenshot on the right shows how useful the software is. The interface also enables easy transfer of .gpx and .loc files to your Garmin or other GPS locationing device. However, if you want to spend $75, you could get their advanced software, ExpertGPS Home, which gives you detailed maps and satellite images!
Today’s smartphones usually feature GPS Locationing by default. There are lots of apps, therefore, that can be used to help you with caching. Geocaching.com have an app of their own, which fully integrates with their website, enabling you to post finds and comments directly to their site. But this costs money, and requires you to be a paid member of their club. It is a little trickier to transfer your .gpx files yourself. I find that I can transfer the .gpx files to my phone easily by easyGPS above. I then need a good app to import that file into. I have found two such apps.
CacheSense (for Android)
If you are sensible to have an Android phone, such as a Samsung Galaxy, then I recommend getting CacheSense. This app is free from Google Play. The interface allows you to import a cache (i.e. a .gpx file). When you use this option, you will simply need to remember where on your phone you put the file, when you copied it there (either by EasyGPS, or by Windows file copy). When you have located and imported the file, CacheSense will then intelligently guide you to your cache!
Looking4Cache (for iPhone/iPad)
If you haven’t yet learned the joys of the open source Android operating system, and you are still tied to overpriced and overhyped Apple products, then try Looking4Cache, available from iTunes. It is also a free app, and I am told can do all the same jobs that CacheSense does. however, I have no intention of buying an iPhone to check this out!
I hope the information on this page is accurate. However, it is obviously subject to rapid change, and none of these suppliers pay me anything or are likely to inform me of any changes to their products or availability. So, I can’t be held responsible for the total accuracy of the above, but would ask that you would please let me know of any changes that I ought to make to this text.