A question about the accuracy of a compass watch?

I was reading a review of the Timex E-Compass watches and wondered about the following statement;





"The Electronic compass is accurate to within 10 degrees and includes a Declination Adjustment Scale."





If it's accurate to within 10 degrees is this going to be a big problem when map reading? Or if I kept taking new bearings would it then be accurate?





http://blog.mywatchshop.co.uk/?cat=66|||That much error is pretty large. It adds up to about 175 meters per kilometer (930 feet per mile). That's too much for most purposes, which is why for serious hikers %26amp; orienteering you more serious equipment.