Contours for up to 2 million acres. Additionally, the built-in GPS lets you mark waypoints, create routes and view boat? Resolution : 800 x 480 pixels.Frequencies Supported: - CHIRP (mid and high) - Traditional: 50/77/200 kHz - ClearV? Please allow us the opportunity to resolve any issues before opening disputes and/or leaving feedback. If the item includes an ac power adapter for use, it will be 120 volts. Please ensure that this product is compatible with the standards within your country before purchasing.