Well went along with an open mind and tested all three today.
1- Skymap - not impresed - reminded me of Spectrum 48k (crossed with a mobile phone brick) with a looooong clunky update when you zoom in/out. Kept waiting to see chunky space invaders drop down from the top line ...
2- Garmin - nice looking unit, small screen, very intuitive menus and easy to use buttons and nicely presented info - especially airfield info. But found the mapping lacking. Colours looked very washed out and the detail level seemed poor - depiction of water features was very 'blocky'. Example, Loch Tulla (just south of Glencoe) doesnt even feature and it is about 2.5 miles long. And some of the high ground is just plain wrong - some out by 1000 feet.
3- Lowrance 2000C - was pleasantly surprised. Better map presentation than both the other (will help the situational awareness 'switch' between GPS map and quarter mil chart). Loch Tulla was well depicted, accurate outline. Seemed to lack placenames or river/loch names. Buttons (particularly the 4 way joystick pad) not as responsive as Garmin and GOTOs needed an extra couple of presses. Buttons will take a wee bit of getting used to, but two presses for airfield info is good. Terrain heights more accurate than Garmin but tricky to find exact peaks... anyway should be looking out the window
£200 cheaper than Garmin
Now if Garmin did a bigger and more detailed display (with touchscreen) then they'd be onto a total winner !!
Any other user comments from the real world ? Ease of inputting waypoints, use in the field ?