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If one of the columns in the Calibration table is bad, you can:
• Over-write it from one of the columns in the Calibration trips table (see step 9
above), or
• Stop is being used in calibration calculations by selecting any one (or all) of
the values in the column by touching it, using the “backspace” key to
delete the value. Columns with any one of the three values blank are not
used; or
• Touch a value in a table to edit it (see below to see how this might be used).
When the calibration process is complete, if there is a printer fitted to the system,
use the Print button to make a print-out of the calibration
data as a record of the process.
It is strongly recommended that the full calibration process is followed as described
above. However, alternative methods are possible:
• One-way trips: if it is certain that there is no effect on water speed from wind
or tide, you can use the results from one direction only:
o At the end of the first run (A to B) touch the end run
button as usual, and then use the Calibration
Trip Use button to use the data from the run so far.
o The Start button will now be flashing, waiting for you to do the return (B
to A) trip. You can clear this flashing as follows: touch it, to start a
“dummy” trip, then touch the End button, and select “Cancel” from
the “Set results in calibration table?” prompt.
• Use GPS speed data; this is ground speed, so only matches the true water
speed if there is no tidal current. But if this is the case, then you could create
a column in the Calibration table as follows:
o Touch the Ref. field and use the keypad to enter the GPS speed that is
shown in the top-left of the window
o Touch the Log field and enter the raw value from the speed log: this is
shown to the left of the Calibration table header.
o Enter zero (or a true value if known) into the Drift field. Blanks in any of
the fields cause the column to be ignored in the calibration
calculations.
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