Worked great. Simple to use. Monochrome screen readable in daylight. Much better than a color screen that drops out after 60 seconds requiring constant operation of the screen button on the color screen version. Operating buttons large enough for large fingers.
Initial lock-on requires some patience.
Getting the initial parameters correctly entered is important.
If you are in an area where there are obstructions limiting satellite view,
try placing it on the roof of your car to allow the roof to function like a rudimentary radar reflector.
This concept works for cell phones too.