User manual GARMIN GPS 18X TECHNICAL SPECIFICATIONS REV. B, JAN, 2008

[. . . ] GPS 18x TECHNICAL SPECIFICATIONS Garmin International, Inc. 151st Street Olathe, KS 66062 USA 190-00879-08, Revision B January 2008 © 2008 Garmin Ltd. or its subsidiaries Garmin International, Inc. 1200 East 151st Street, Olathe, Kansas 66062, U. S. A. [. . . ] The GPS sensor will echo this sentence upon its receipt if no errors are detected. If an error is detected, the echoed PGRMC sentence will contain the current default values. Current default values can also be obtained by sending $PGRMCE to the GPS sensor. $PGRMC, <1>, <2>, <3>, <4>, <5>, <6>, <7>, <8>, <9>, <10>, <11>, <12>, <13>, <14>*hh<CR><LF> Fix mode, A = Automatic, 3 = 3D exclusively Altitude above/below mean sea level, -1500. 0 to 18000. 0 meters Earth datum index. If the user datum index (96) is specified, fields <4> through <8> must contain valid values. Otherwise, fields <4> through <8> must be null. Refer to Appendix A: Earth Datum List for a list of earth datum and the corresponding earth datum index. <4> User earth datum semi-major axis, 6360000. 000 to 6380000. 000 meters (. 001 meters resolution) <5> User earth datum inverse flattening factor, 285. 0 to 310. 0 (10-9 resolution) <6> User earth datum delta x earth centered coordinate, -5000. 0 to 5000. 0 meters (1 meter resolution) <7> User earth datum delta y earth centered coordinate, -5000. 0 to 5000. 0 meters (1 meter resolution) <8> User earth datum delta z earth centered coordinate, -5000. 0 to 5000. 0 meters (1 meter resolution) <9> Differential mode, A = Automatic (output DGPS data when available, non-DGPS otherwise), D = Differential exclusively (output only differential fixes) <10> NMEA 0183 Baud rate, 3 = 4800, 4 = 9600, 5 = 19200, 6 = 300, 7 = 600, 8 = 38400 (for GPS 18x-5Hz only) <11> No Effect (This field is not used on this model and is included only for backwards compatibility) <12> Measurement Pulse Output, 1 = Disabled, 2 = Enabled <13> Measurement Pulse Output pulse length, (n+1)*20 ms For 18 LVC/PC n = 0 through 48 (max. 980 ms) For GPS 18x-5Hz n = 0 through 8 (max. 180 ms) Example: n = 4 corresponds to a 100 ms wide pulse <14> Dead reckoning valid time 1 to 30 sec. for the GPS 18x PC/LVC or 0. 2 to 30. 0 sec. for the GPS 18x-5Hz All configuration changes take effect after receipt of a valid value except baud rate and Measurement Pulse Output mode. Baud rate and Measurement Pulse Output mode changes take effect on the next power cycle or an external reset event. <1> <2> <3> 190-00879-08 GPS 18x Technical Specifications Page 13 Rev. B 4. 1. 4 Additional Sensor Configuration Information (PGRMC1) The $PGRMC1 sentence provides additional information used to configure the GPS sensor operation. Configuration parameters are stored in non-volatile memory and retained between power cycles. The GPS sensor will echo this sentence upon its receipt if no errors are detected. If an error is detected, the echoed PGRMC1 sentence will contain the current default values. Current default values can also be obtained by sending $PGRMC1E to the GPS sensor. $PGRMC1, <1>, <2>, <3>, <4>, <5>, <6>, <7>, <8>, <9>, <10>, <11>, <12>, <13>*hh<CR><LF> NMEA 0183 output time 1 to 900 (sec). Not applicable to GPS 18x-5Hz, which always outputs data at 5 Hz (200 ms) <2> Binary Output Data, 1 = Off, 2 = On. <3> No Effect (This field is not used on this model and is included only for backwards compatibility) <4> No Effect (DGPS beacon frequency: 0. 0, 283. 5 to 325. 0 kHz in 0. 5 kHz steps) <5> No Effect (DGPS beacon bit rate: 0, 25, 50, 100, or 200 bps) <6> No Effect (DGPS beacon scanning, 1 = Off, 2 = On) <7> NMEA 0183 version 2. 30 mode indicator, 1 = Off, 2 = On <8> DGPS WAAS mode, W = WAAS Enabled, N = WAAS Disabled <9> Power Save Mode, P = Power Save mode, N = Normal <10> No Effect (This field is not used on this model and is included only for backwards compatibility) <11> No Effect (This field is not used on this model and is included only for backwards compatibility) <12> No Effect (This field is not used on this model and is included only for backwards compatibility) <13> Measurement Pulse Output Auto Off Mode, 1 = Off, 2 = On Configuration changes take effect immediately, with the exception of Binary Output Data, which takes effect on the next power cycle or a reset event. [. . . ] Sensor Configuration (F6): Opens the Sensor Configuration Window, shown to the right. Many of the fields in this window should be left alone. Please refer to the beginning of this manual for clarification about some of these fields. For the most part, this window is used to enter a new latitude, longitude, and altitude for the sensor. [. . . ]