C-MAP'S NT+ electronic charts provide navigators with improved performance and advanced features. The vector charts have search functions to help anglers locate desirable objectives, including wrecks, port services and tide stations. The charts have a wide variety of selectable presentation modes and pre-defined chart display options, as well as expanded coverage areas. NT+ also provides Guardian Technology, an anti-grounding function that alerts the crew when the course will put the vessel in danger of shallow water. While NT+ electronic charts may be used in C-MAP NT-compatible plotters, all the features are accessible through specially designed NT+ systems produced by Simrad, Standard Horizon, SI-TEX, NAVMAN USA and Interphase Technologies. Prices for C-MAP NT+ start at $99 depending on the geographic coverage. C-MAP, Mashpee, MA; (800) 424-2627; www.c-map.com.