Not suited to iTouch, nor east coast

I bought this on impulse as I was heading to a tidal area near me. It was key (as advertised) that I be able to use it offline when NOT IN A WIFI area, becuase coastal areas are almost by definition wireless.
After I purchased it in a coffee shop, it was "updating" for about 15 minutes, before I ended up leaving the shop. So when I got home, I let it run all night - still updating in the morning. So I un-installed and re-installed it twice. Still cant get it to work. The way you "seem" to be able to enter manual lat/lon is not very intuitive, and has no help text.
I still cant get it to work. Sent two support queries this am so we will see what happens next.
I have never had this much problem with any other apps.

robvann about Tides