Navigation Equipment

The 320 differs mainly from the 315 in A. being more expensive and B.having a navigational aid database for use at sea. I cannot say that I find the navaids much use, as I can barely see them on the small LCD (though its no smaller than other handheld GPS screens) screen, and find it becomes too cluttered to read the names anyway. However, I suppose that if ever you end up somewhere you have not got a chart for then you MIGHT need it (providing you've kept it updated of course). The unit itself is excellent, and I find it gets a position and lock in my criusing area much quicker than I've heard folks talk about elsewhere - whether thats down to the unit or my ...  Read the complete review