Garmin 16-HVS Instruction Manual

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Garmin 16-HVS Instruction Manual Manual pdf 17 page image

Appendix A. CR23X/CR10X ProgramsA.1.3 FiltersFilters can be used to make sure P15 reads the correct data string. Filters alsoensure P15 starts to read the string at the beginning of the string. To use afilter, follow P15 with instruction P63 (extended parameters). P63 is used todefine the filter. Enter the desired filter in P63.TABLE A-2. FilterASCII Equivalent Character36 $71 G80 P71 G71 G65 AA.1.4 Managing the DataSeveral of the data values in the $GPGGA string are too large to view or writeto final storage. Some simple math is used to parse the data.The UTC time is in the format hhmmss where hh is the hours, mm is theminutes and ss is the seconds. Six digits are too many to view with thedatalogger display and some software. Add 0.3 to the raw time field. Multiplythe raw time input location by 0.01 to reduce the magnitude and place theseconds in the fractional portion of the number. Next use P45 to write theinteger portion (hours/minutes) to a new input location, then use P44 to writethe fractional portion to another input location (seconds) and multiply thatlocation by 100. The last step is to use P45 again to take the integer portion ofthe input location for seconds. The result is hour/minutes in one input locationand seconds in another.The latitude and longitude can be parsed with the P15 instruction when decimaldelimiter is on. If P15, parameter 2 is 6x, where the x selects the baud rate,every non-numeric value and decimal point will act as a delimiter. TheDegrees and Minutes will be placed in one input location, and the minutefractional portion will be placed in the next input location. The decimaldelimiter preserves the resolution of the original measurement.Further parsing of the latitude and longitude may be necessary. Longitudedegrees and minutes can range in value up to 18059, which exceeds the lowresolution format of the dataloggers final storage area. Either parse the latitudeand longitude degrees and minutes the same way the time was parsed, or storethe data in high-resolution format.The GPS quality number can be used to determine if you have a valid GPS fixand if the datalogger received the data properly. Use P89 to test if the GPSquality number is greater than or equal to one. There is a catch to using theGPS quality number to verify your data. P15 will write to fifteen inputlocations if everything works correctly. If P15 fails to read the GPS data, onlyA-3