which £500 gps?
 

The choice seems to be between a skymap 2 and a garmin 196. The unit will be panel mounted with power and antenea. I have used the skymap on a few occasions and found it very good but hard to see in direct sunlight - it is a little bulky for the space available but would squeeze in. The 196 is smaller I know but I wonder how the `greyscale` display stands up in varying light conditions. Are there any other considerations I need to make ?
Thanks..

The 196 greyscale works very well and the unit is backlight too, so is readable in all but the strongest reflective sunlight.