sorry can't really say but would think they have to give you a warning. Not sure what job you do but have already on AB seen someone saying today they could not get home from somewhere cause did not have a sat nav. Keep hearing they can be a bit unreliable that perhaps worthwhile you investing in a good old A to Z and doing a bit of research before heading to somewhere - could you perhaps even phone the place in advance to find out exactly where you should be going? Just giving a couple of suggestions that may help your boss feel you are really going to try harder. Hopefully they will be sympathetic to the situations you have found yourself in but also difficult for those trying to run a business. Good luck.