Hi,
To go back to the last part of your original question...
I am using an HTC One S smartphone.
I am relatively new to the whole World of Geocaching, and am having a great time with it...but I wanted to 'increase my accuracy' too. So, I bought (second hand) a Garmin Geko 201 hand held GPS, to see if it were "any better".
This is where I am now up to....
I have found the Geko fairly awkward to use ( I know it's a bit 'Old Skool' - but wanted to try it out), it is mainly awkward because of the whole having to type the co ordinates in manually situation. This may be a surmountable problem, but only if I invest in a data cable - which will cost me about the same as the second hand Geko! Not worth it when finances are tight.
I found the Geko to be no less, and certainly no more accurate than the GPS in my smartphone.
1 - 0 to the smartphone.
I therefore Googled/and PlayStore searched for "best GPS APPs" and have now been playing with "GPS Status" and "GPS Essentials". Both are great and way beyond what I am prepared to comprehend...but from the little playing I have done, whilst these apps are great for 'looking at satellites' - geeky...but not particularly useful for Geocaching(!), I am not sure what they offer above and beyond what my main geocaching app, c:geo, gives me.
I seem to still have to copy/paste/input manually the co-ordinates in to my GPS dedicated apps. I did this, and as well as c:geo, have literally just got in from walking down to the local shop to get milk...and passed a known cache. I honed in on it using all three apps...
As a comparison, all three apps performed equally. All counted down the metres to the cache, pointing me in the correct direction, all flickering between 3 and 7 metres accuracy.
It's a clear night here in Oxfordshire, UK. A quiet country path with intermittent light tree cover.
Once I was standing 'over the cache', all the apps said - "3metres over there"...so were equally all "out" by some factor...
My understanding is that GPS Essentials is often in the top 10 Android Apps, in general.
What have I learned...?
The biggest thing I have realised, which is specific to me..and how I cache...and perhaps specific to the more urban nature of Blighty - ie NOT trekking off into the wilderness for days on end - we can't, we run out of country pretty quick on this little island! The biggest lesson is that...I don't really need anything more accurate that 3 - 4 metres...and in fact, I don't think my 'game play' utilises a GPS at all. I read the description. if necessary I read any clues, I look at previous logs...and I hunt around. That's how I find caches...NOT by honing in to within a few feet of a location....
So, in summary: for me, the GPS apps and devices are all well and good, but are of no practical use for my game play. c:geo does what I need - it allows easy access to all the relevant details - cache details, description, logs, clues...and, should I want to use a compass to navigate - the co ordinates are all there already. I can also log on the spot, mostly, too.
I hope this goes some way to help. As I too have been looking into this, it seems you guys have a bigger wilderness to deal with, so a dedicated GPS may make more sense, but for me, when it comes down to it, it seems my phone suits me down to the ground(speak)!
Happy caching!
AbingDanClan