I have used a GPS system out on the trail for many years, but wanted a unit to use with my own maps, and with a good battery life.
This is a sturdy unit, and the buttons are also large and positive which allows easy use with gloves.
The screen is clear in sunlight and the maps are easy to read. Also waterproof. It connects with USB to a computer, lead included.
The maps supplied are the UK OS full set at 1:50000 The equivalent of the old 1" series and the ideal for national coverage.
The micro SD card that includes them needs to be inserted in the holder underneath the battery. After that they are simply there to be used.
I downloaded the free vector map for Europe and this installed without any problems.
I have used the shareware program mapctomapc to calibrate my own jpeg map images, create a kmz file, and then upload them to this unit without any problem. The same kmz maps display on google earth so are easy to check.
The only negative is the restriction that Garmin places on raster maps. You are limited to 100 map tiles at any one time, and a maximum jpeg image size of 200 Mb. However you can switch maps easily with a portable computer. A map could be 100 tiles along a linear route or the course of a river etc. or several separate groups of tiles. Do go to the garmin website and add a request for this restriction to be removed.
There doesn't seem to be any limit to using your own vector maps, and excellent free ones are available for many countries.
As a functional unit this is possibly the best there is at the moment.
So far I haven't managed to lose the satellite signal in deep forest - unlike my previous unit.
It saves its tracks as GPX format. Display on Google Earth with ease. No other software needed.
You can use UK postcodes to locate a point as well as address, grid coordinates etc.
A well deserved 5 stars.