Table Of Contents - Garmin GPS 25 LP Technical Specification

Table of Contents ............................................................................................................. i
Section 1 ......................................................................................................................... 1
Introduction................................................................................................................... 1
1.1 Overview........................................................................................................... 1
1.2 Naming Conventions ........................................................................................ 1
1.3 Features ........................................................................................................... 2
1.4 Technical Specifications................................................................................... 3
1.4.1 Physical Characteristics ............................................................................. 3
1.4.2 Environmental Characteristics.................................................................... 3
1.4.3 Electrical Characteristics ............................................................................ 3
1.4.4 Performance ............................................................................................... 4
1.4.5 Interfaces.................................................................................................... 4
1.5 Application ........................................................................................................ 5
1.5.1 Application Considerations......................................................................... 5
Section 2 ......................................................................................................................... 7
Operational Characteristics .......................................................................................... 7
2.1 Self Test ........................................................................................................... 7
2.2 Initialization....................................................................................................... 7
2.3 Navigation......................................................................................................... 8
2.4 Satellite Data Collection ................................................................................... 8
Section 3 ....................................................................................................................... 10
Hardware Interface ..................................................................................................... 10
3.1 Mechanical Dimensions.................................................................................. 10
3.2 Connector Specifications................................................................................ 10
3.3 Connector Pin-Out.......................................................................................... 11
3.4 Antenna Connection ....................................................................................... 14
Section 4 ....................................................................................................................... 16
Software Interface ...................................................................................................... 16
4.1 NMEA Received sentences ............................................................................ 16
4.1.1 Almanac Information (ALM) ...................................................................... 16
4.1.2 Sensor Initialization Information (PGRMI) ................................................ 17
4.1.3 Sensor Configuration Information (PGRMC) ............................................ 17
4.1.4 Additional Sensor Configuration Information (PGRMC1) ......................... 18
4.1.5 Output Sentence Enable/Disable (PGRMO)............................................. 19
4.1.6 Tune DGPS Beacon Receiver (PSLIB) .................................................... 20
4.2 NMEA Transmitted Sentences........................................................................ 20
4.2.1 Sentence Transmission Rate.................................................................... 20
4.2.2 Transmitted Time...................................................................................... 21
4.2.3 Global Positioning System Almanac Data (ALM) ..................................... 22
4.2.4 Global Positioning System Fix Data (GGA) .............................................. 22
4.2.5 GPS DOP and Active Satellites (GSA) ..................................................... 23
4.2.6 GPS Satellites in View (GSV) ................................................................... 23

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