I also have Navionics uk/holland...... All I can say is wow!
For 25 quid on my htc smart phone, gives tide times, heights, wind speed/direction, a detailed colour map with tracking, measurements/distance, great zoom features. I find it really usefull for inshore fishing, and well worth the money for a back-up chart system or in addition to a paper chart. recommend to anyone.
Also incase you are wondering, it works without wireless connection just on the gps and shows your position on the chart at all times. also lat and long etc.