Nautical GPS devices are not essential for fishing, but they do make fishing easier in terms of locating marine life and choosing fishing spots. Professional fishermen often use these devices to record the regular movements and popular locations of fish shoals.
Nautical GPS systems provide information such as water depth and underwater structure locations, which experienced fishermen can use to determine the best fishing areas. A fish finder is a type of nautical GPS device that uses sonar to locate and display aquatic life. Most fish finders are simple enough for amateur fishermen to use and are available from major brands including Garmin and Bass Pro.