I've had 2 Navman fuel flow meters and neither has worked properly. On my 23 that I sold to tcorks the screen took a crap and I've had problems with the flow sensors have acting up. One minute they are working fine and the next they are not. Now the one on my 20sf is reading zilch...zippo...nadda
Customer service is important however I'd rather never to have to make the call in the first place.
strick