That's great news. Glad to be of help.

My experience of TT's OSM maps is that there is just no off-road detail on them in the areas that I walk in.

My first choice is to go on using the Mio for now, there seems to be much development going on in the world of hand held GPS and other may be giving Garmin a run for their money.

I think you're absolutely right. With Garmin going down the Android route we could be in for big changes and new competition. You also have the best maps available (apart from the new MM HD maps), so why not use them if you are happy with the device. Your SiRFStar III Mio is most likely more accurate than the current breed of Garmins too.

Here's a screenshot to give you an idea of how it looks.

How do you prepare your hiking/geocaching trip now? I used to maintain a GSAK database, export data to Memory Map, plot my route, send the route to my GPSr then export cache listings from GSAK to my GPSr.
mapRoute makes the whole process so much easier, cheaper and better.
mapRoute uses the latest 1:25K Ordnance Survey maps and being an official Geocaching Live partner app means that geocaching data is up to the second to, so no databases to maintain or potentially out of date PQs to mess about with. Geocaches appear at the press of a button. Once you've created your route(s) you save them on the server ready to export as a gpx file whenever you want, but here's the smart part. You can also download all geocaches within the area that route covers (and waypoints, hills, trigpoints too). You can share routes with other users and there are even interactive elevation graphs. There are loads of other features too, and they are being added to on a daily basis.
While I have created a couple of tutorials on YouTube the application is developing so fast that they soon become out of date, though the basic route and geocache concept remains the same.
This app was written purely to benefit the walking and geocaching communities. There is no profit from my perspective, only cost, not to mention hundreds of hours of work.
Being developed by an active walker and geocacher I hope I know what users want, but if there's a feature that you want that mapRoute doesn't currently provide I would love to hear about it.

Also remember that tools like the OS Get-a-map provide less functionality and cost £20 per year. Please take a look. I hope you find it useful.

http://map-route.co.uk

Just a quick note to say that Memory Map (and Satmap) have just slashed the price of their 2014 OS maps. Amazingly, it's now Garmin Discoverer that looks over-priced.

Just joined up to make a couple of points on this thread.

Although I'm a big fan of the dedicated GPSr I have also used smartphones to assist the process for a number of years now. OS maps on a large, high resolution screen are something else.

For those that don't want a mobile phone contract, are you aware of OVIVO? They operate on the Vodafone network. You buy the SIM (£20) and that's it, you never pay anything again. Every month you get 150mins of calls, 250 texts and 500MB of data for free, which is plenty for a light user just wanting to look up geocache listings. Every month these allowances are renewed. I know it sounds too good to be true, but there you go.

I'm sure that many people are aware that MM Tracker was available for Android. This was an unofficial app that filled the Memory Map gap on the Android platform. If you have access to Memory Map QCT maps this works beautifully with them. It was shut down by Memory Map, but you can still find the application via unofficial channels.