IMHO, all of these electronic compasses in the wrist watches are not good for navigation simply because the sensor used in them have something like 50 positions, i.o.w. its like ~7 deg. precision. You can tell where the North is, but I doubt it's good for any serious navigation by azimuth bearing in the field. Also take a closer look at those "cool" bezels on them. Marks every 30 deg.? Almost any analog compass is better.