The LMS240 is the first and only compact combo SONAR+GPS unit using Multi-Media Cards (MMC) so you can: digitally record & playback sonar graphs and GPS trip details with paper free ease, instantly expand the unit's memory from 8MB to 64MB with one MMC card, record/save your GPS trip details on a MMC card for playback on the unit, or your personal computer, and load customized MapCreate maps you make on a personal computer to an MMC card for navigation on the unit (waterproof slot accepts single card). The LMS240 also has depth penetration to 1,000 feet w/ 3,000 watts of peak-to-peak transmit power. The unit possesses all of the Sonar/Fishfinder features that the Lowrance X91 has but adds the GPS Mapping features such as: 12-parallel channel GPS reception w/ fast, strong lock-ons, precise tracking, and position updates every second, built in custom Lowrance background map features enhanced water, shorelines, coastal and highway mapping detail for America's 48 contiguous states and Hawaii, easy point-and-map route planning and cursor navigation, mega-memory saves up to 1,000 waypoints, 1,000 event markers, and 100 routes. The unit has capacity for 10 savable plot trails w/ up to 10,000 points trail, choice of 42 different graphic icons to mark key spots, and over 30 different map zoom display ranges from 0.1 - 4,000 miles. The LMS240 display is a high definition 3.3'' square, w/ 240 x 240 pixel high-contrast film super twist LCD that produces excellent sonar and mapping definition even in direct sunlight! For your protection, the LMS240 has: internal back up memory that preserves sonar settings and GPS data for decades, sealed, high impact, waterproof covering for harsh saltwater environments, and a full one year factory warranty. Unit dimensions: 6.9''W x 6''H x 2.9''D w/ easy to mount compact case design.