MagSurvey Setup

Home Up

MagSurvey Software Setup


This value is the horizontal towing distance of the sensor (magnetometer fish) from the boat’s GPS antenna, within a range of (-) eleven feet in front of the antenna to 392 feet behind the antenna. For the two smallest scale modes, these distances are limited to 192 feet and 98 feet.  MagSurvey relies on this layback value and on Track-Over-Ground (TOG) information from the GPS to determine the recorded values of sensor latitude and longitude. It is important that the sensor be as close to directly behind the boat’s track as is possible whenever LOGGING is enabled. Best results are obtained by towing the sensor as close to the boat as can be done without significant effects to the readings from the magnets, ferrous materials, and electrical currents present on the boat. Best positioning results are also obtained with track-over-ground close to 0, 90, 180 or 270 degrees. For boat-towed operations, it is best to have the GPS antenna centrally mounted at the stern of the boat or, if practical, to have the GPS antenna remotely-mounted on a towed float directly above the sensor.  For land survey operation, set distance behind boat to zero.

To set the distance-behind-boat value, click SETUP and Distance Behind Boat from the menu at the upper left of the MagSurvey screen. A popup form will appear with a display of the currently-set value. Change the value as necessary and then press OK, or ENTER (or press Cancel to exit without changing).

horizontal rule


The GPS and Magnetometer should be connected to the computer’s two available serial ports. Click Setup and Equipment and Communications from the menu at the upper left of the MagSurvey Screen. A popup form will appear.

Setup of Communications Ports
On a new installation, set the com-port numbers and the baud rate settings to match the data coming from your magnetometer/detector and your GPS.  Sensing combined data on a single channel is also possible if your equipment supports this configuration (set "Combined with Mag" on the GPS selector).  On some GPS receivers, choosing a higher baud rate might allow for more frequent position updates (one second vs. two seconds).  Refer to Equipment Requirements (above) and to your equipment manuals for information on baud rates.  If you haven't noted the com-port numbers during first installation, you will need to go into Windows Control Panel to get the information.  Different versions of Windows have different paths to retrieve these numbers.
Setup of Magnetometer Type
The form also has selections for magnetometer type, as well as areas for entering offset and scale factor information for magnetometers with depth and altitude sensors installed. The offset and scale factor values for the Geometrics magnetometers are determined by using the Geometrics software included with the magnetometer (this software may also be downloaded from the web site).
Setup of the Active Survey Scale
The form also has an area for the selection of the active survey scale.  Select the default 0.004 minutes of lat/lon (large-scale, recommended for marine surveys --1224 feet north-south), one of the two smaller scales (best for land surveys), or one of the three larger scales.  The selected scale determines the maximum area for the survey, and further information is included on the setup screen.  For each mode you can only reload or save files of the same scale.  Additional scales are available for rough searches.
Zero Depth Readout
A button exists to zero the reading from the depth sensor of marine magnetometers so equipped.  The magnetometer should be on the deck of the boat or on the surface of the water for use of this feature.
Magnetometer Display Sensitivity Mode Setting
MagSurvey has two sensitivity settings that affect the 2D and 3D display plots, and the magnetometer graph.  The default is Normal sensitivity, but you may choose High sensitivity for surveys involving very weak anomalies.  The saved data is the same for both modes, and surveys can later be brought up for display in either mode.
Require Differential Corrections Check-Box
MagSurvey defaults to requiring differential GPS corrections in order to assure the best accuracy of plotted anomalies -- PSI strongly recommends operation in this mode.  However, if the user is comfortable plotting anomaly locations without WAAS, radio beacon, or other differential corrections being required, then this check-box may be unchecked by clicking with the mouse button.
Enable Sounds Check Box
Check this box to enable MagSurvey sounds to be heard on your PC's speakers.  This will enable a bell sound to be heard when the sensor is detecting anomalies greater than five gammas above or below the zeroed value.
Display Size
If your PC supports a resolution of 1280 (wide) by 768 (high) display, or higher, you should select this wide-screen option.
Setup the Software License Key
MagSurvey was costly to develop, involving large amounts of research and software development time. To prevent pirated use of the software, MagSurvey takes certain information from the computer to compile an identifying number which is shown on the Setup screen as the Installation Code. MagSurvey is sold for use on a single computer and multi-computer licenses are available at an extra cost. Two modes of operation are possible:
  1. Full Licensed CapabilityTo Enable the full capability of the program it is necessary that the user purchase a license and phone (561-433-0033) or E-Mail ( ) the SETUP screen’s Installation Code number to Perception Systems, Inc. in Florida, USA. For registration, customer name, address, and contact information will be required. At that time, a Software License Key number will be provided. Enter this number exactly into the space provided, select save (see below), and MagSurvey will be fully functional the next time the program is run. Record your numbers, and keep them for future reference.  The license key enables a single computer to run MagSurvey for land and marine surveys.
  2. MagSurvey DemoFor evaluation purposes, most of the features of MagSurvey are enabled without entering a Software Key number.  This gives the potential purchaser an indication of how MagSurvey will work in his particular setting, with the equipment that he has on hand.  Save-Survey, Print-Screen, and screen redraws are disabled in this mode; and messages on the plot screen reduce the usable survey area. The MagSurvey demo software can be used as a fully functional tool to review previously recorded surveys, thereby allowing analysis on separate office computers at no additional cost.

Finally, make any additions or changes necessary, and either select Save New Setup Parameters to save, or select Cancel to exit without saving. These saved values are stored in a file called MagSurvey.Cfg, and will be loaded as defaults whenever MagSurvey is run.

horizontal rule

Donald O. Land

8117A Northboro Ct, West Palm Beach, FL 33406 USA

Tel:561-433-0033        Email: