Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Better GPS but not best!

The Navman iCN750 is a full feature, large screen, easy to use GPS. However, it has a few features that make it less than perfect. In 3D mode the display rotates when it cannot "lock" onto a mapped item. As a result, in a large parking lot or any open space, the display rotates sickeningly. Since the satellite acquisition time seemed so long, I purchased an external antenna and still have not found out how it is supposed to connect positively to the iCN. Trying to get technical support from Navman is more than frustrating, it is a disgusting and inadequate process. Their technical help seems to have never seen an iCN750, so cannot relate to anything reported. The juvenile answers could be expected from an ice-cream vendor but not from a high tech product producer. The 4 star rating is given for the quality of the map display, but I am really disappointed in this product and Navman support.