Lowrance electronic HDS-5, HDS-7 manual GPS Not Accurate, 119

Troubleshooting

5.When no noise appears on the sonar unit after all of the above tests, then the noise source is probably cavitation. Many people make sonar installations which function per- fectly in shallow water, or when the boat is at rest. In most cases, the cause of the malfunction is the location and/or angle of the transducer. The face of the transducer must be placed in a location that has a smooth flow of water at all boat speeds. Read your transducer owner’s manual or the Installation instructions in this manual for the best mounting position.

GPS Not Accurate

1.Lowrance Electronics obtains its mapping data from gov- ernment agencies. Mapping is not an exact science. A unit’s GPS position (Latitude/Longitude) can be extremely accu- rate, but the location of a cartographic item such as a street, highway, or point-of-interest may be slightly inaccurate. In most cases, we have found the mapping detail in our prod- ucts to be very accurate. We encourage the reporting of inaccuracies or omissions so that we can consider them for future revisions. Please consider that our products are designed to be aids to navigation and not the sole means of navigation. A prudent navigator will also have several items necessary for safe navigation.

2.The accuracy of your position could look different at various zoom ranges. For example, at a 5 mile range, the cursor representing your position may appear to be in the center of a highway your are driving on. However, if you zoom into a much closer .1 mile range, the position may appear off- center due to the variables mentioned above.

3.Try this simple method to verify that the GPS receiver in your unit is accurate. Have your unit lock onto GPS position in a known location like your driveway, boat slip, or camp- site. Save that location in the unit as a waypoint. Now trav- el away from the known location. Stop and recall the saved waypoint in the unit. Select GO TO to start the unit navigat- ing back to that location. Observe the Distance To Go data as you travel back to that location. When you arrive at your waypoint, the Distance To Go should be close to 0.

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