
SeaMarks manual VI. Menu Reference •
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6.2 Calibrate Conversions
This procedure first determines which calibrations style best suits you. The choices are:
Use the government tables calibrated with your calibration waypoints.
Use the government DMA tables as-is to perform the conversions. This is the no calibration option.
Use a single set of ASF values for all waypoints in the file based on either an entered value or the average of the
calibration waypoints.
See chapter V section 1 and 2 for details on how to chose the best method for you. Initially, chose method 1 to get
started. Several areas have already been calibrated, so the user-calibrated tables are the best choice. For those areas that
are not pre-calibrated, choices 1 and 2 are equivalent until you have performed a calibration.
If you have chosen either method 1 or 3, and have entered all your calibration waypoints, push the Perform
Calibration Now Button. In the process of calibrating the conversions, a file is created that contains all the calibration
waypoints. It is called Calib~ASF.dbf and will contain all the calibration waypoints of all the files you have calibrated
with. Therefore, the program will apply calibration waypoints from one file to another if they are in the vicinity. You
can chose to begin anew by erasing the old calibration file while calibrating if you believe that it has been contaminated
with questionable data. Once the calibration routine is finished, it will recalculate all the conversions in the file. A
report on the calibration results is then generated. This report can supply valuable information on the quality of your
data. You might find, for example, that all the calibration waypoints taken on a particular day are suspiciously
inaccurate indicating a hardware problem on that day. Here is a typical calibration report.
St. Pete Calibration Report
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