GARMIN GPS Interface Specification

Table Of Contents
1. Introduction.........................................................................................................................................................5
1.1. Overview .....................................................................................................................................................5
1.2. Definition of Terms .....................................................................................................................................5
1.3. Specification of Data Types.........................................................................................................................5
2. Protocol Layers...................................................................................................................................................6
3. Physical Protocols...............................................................................................................................................7
3.1. P000 – Default Physical Protocol ................................................................................................................7
4. Link Protocols.....................................................................................................................................................8
4.1. L000 – Basic Link Protocol.........................................................................................................................8
4.1.1. Packet Format.......................................................................................................................................8
4.1.2. DLE Stuffing ........................................................................................................................................8
4.1.3. ACK/NAK Handshaking......................................................................................................................8
4.1.4. Basic Packet IDs...................................................................................................................................9
4.2. L001 – Link Protocol 1................................................................................................................................9
4.3. L002 – Link Protocol 2..............................................................................................................................10
5. Overview of Application Protocols...................................................................................................................11
5.1. Packet Sequences.......................................................................................................................................11
5.2. Packet Data Types .....................................................................................................................................11
5.3. Standard Beginning and Ending Packets ...................................................................................................12
5.3.1. Records_Type.....................................................................................................................................12
5.4. GPS Overwriting of Identically-Named Data............................................................................................12
6. Application Protocols........................................................................................................................................14
6.1. A000 – Product Data Protocol...................................................................................................................14
6.1.1. Product_Data_Type............................................................................................................................14
6.2. A001 – Protocol Capability Protocol.........................................................................................................15
6.2.1. Protocol_Array_Type .........................................................................................................................15
6.2.2. Protocol_Data_Type...........................................................................................................................15
6.2.3. Tag Values for Protocol_Data_Type ..................................................................................................15
6.2.4. Protocol Capabilities Example ...........................................................................................................16
6.3. Device Command Protocols ......................................................................................................................17
6.3.1. A010 – Device Command Protocol 1.................................................................................................17
6.3.2. A011 – Device Command Protocol 2.................................................................................................18
6.4. A100 – Waypoint Transfer Protocol..........................................................................................................19
6.5. Route Transfer Protocol.............................................................................................................................20
6.5.1. Database Matching for Route Waypoints...........................................................................................20
6.5.2. A200 – Route Transfer Protocol.........................................................................................................20
6.5.3. A201 – Route Transfer Protocol.........................................................................................................21
6.6. Track Log Transfer Protocol......................................................................................................................22
6.6.1. Time Values Ignored by GPS.............................................................................................................22
6.6.2. A300 – Track Log Transfer Protocol..................................................................................................22
6.6.3. A301 – Track Log Transfer Protocol..................................................................................................23
6.6.4. A302 – Track Log Transfer Protocol..................................................................................................23
6.7. A400 – Proximity Waypoint Transfer Protocol.........................................................................................24
6.8. A500 – Almanac Transfer Protocol ...........................................................................................................25
6.9. A600 – Date and Time Initialization Protocol...........................................................................................27
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