There is a wide variety of nautical handheld marine gps navigational units available today. All are waterproof with various features and screen sizes. One feature that seems constant, besides the waterproofing, is the preprogrammable database of rivers, lakes and nautical markers such as buoys, lights, sound signals and day beacons among other things. One of the smaller, handheld marine gps systems packs a lot of features into a tiny portable. This particular handheld marine gps receiver comes with an exclusive 16 MB database of rivers, waterways, lakes, nautical markers, lighthouses and buoys to help you navigate your way around the waters. It also contains latitude and longitude bearings and helps you determine sunrises and sunsets along with moon phases. You can store tracking points and routes; it also comes with a mounting clip for the dash.
Another handheld marine gps with a rugged, waterproof outer shell is on the market that can boast up to 115 MB of internal memory, that's 10 times the normal amount and allows you to download the optional BlueChart or "Recreational Lakes with Fishing Hot Spots" marine cartography - the difference in the two is that the BlueChart features depth contours inter-tidal zones, navids and wrecks; whereas Recreational Lakes with Fishing Hot Spots gives you fishing areas, marinas, boat ramps and hazards for more than 1,000 United States and Canadian lakes. Other features on this particular handheld marine gps include 1,000 user waypoints with graphics symbols and name; 10,000-point automatic track log and 20 saved tack logs, so you can retrace your tracks in both directions; 50 reversible routes; an audible alarms for anchor dragging, arrival, off course, proximity, waypoint and clock and a trip computer that provides an odometer, moving average, overall average, stopped time, total time and max speed.
The latest in handheld marine gps technology is a navigational adventure system which offers an extensive 16 MB with built-in mapping database of several fixed nautical markers including lighthouses and buoys and displays not only the latitude, longitude and bearings, but the knots as well. Many of the marine gps units, this one included use the WAAS technology and 12 satellites to help locate and remain within 3 meters of a location. Built-in mapping databases of North America include highways, city locations, airports, waterways and lighthouses. In addition, there is a compass, a map, text readouts of headings, bearings and direction and a speedometer and much, much more.
Several of the latest in handheld marine gps technology offers fisherman and women the opportunity to catch more fish by 'showing' them where the fish are. There are many curves in the land under the waters banks and fish like to hide in them but we can never see exactly where they are, except for now. With the new technology, we can view the contours and cave-like structures to find out if the fish are going into them or just what is in them.
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