This page lists the most common problems that many users seem to have.

see also Trouble Shooting   OziExplorer Crashes my System

Communications with the GPS

Garmin GPS - Upload/Download

When using a Garmin GPS and are having problems uploading/downloading make sure you check these settings:

GPS - set the GPS Interface to GRMN/GRMN HOST mode. On newer model Garmins the mode is just called GARMIN.

OziExplorer - set the GPS Upload/Download Baud rate to 9600, garmins always do upload/download at this speed.

Garmin GPS - Moving Map mode (NMEA)

When using a Garmin GPS and are having problems using Moving Map mode make sure you check these settings:

GPS - set the GPS Interface to NMEA/NMEA mode. On newer model Garmins the mode may be called NMEA OUT.

OziExplorer - set the GPS NMEA Baud rate to match the GPS, on most Garmins this is set automatically to 4800 and cannot be altered.

If using a Magellan GPS try a Baud rate setting of 9600, even though they have an option of 19200 I have never found one that works at this speed.

Make sure you have the baud rate settings the same in the GPS and in Oziexplorer.

Waypoint Positions (any positions) do not agree.

If your waypoint positions are not where you think they should be it is most likely caused by a datum mismatch. Typically a datum problem can alter a position by 50 to 200 meters but it could be less or more for some datums.

Datums are complicated and many users seem to get these settings wrong.

See Datums help for more information.

When using "Moving Map" and you position is slightly off the correct position on the map check these items:

  1. That you have the Map Datum set correctly.
  2. That you have the OziExplorer GPS NMEA Output Datum set correctly. For Garmins this must be set to the same datum as the GPS, for most other GPS's it should be set to WGS 84. The Eagle Explorer and Lowrance GN200 require it to be set to match the GPS datum.

See Datums help for more information.

When calibrating a map and are using readings from your GPS make sure the readings were taken with the GPS datum set to the same datum as the map.