Differences

This shows you the differences between two versions of the page.

--- guides:apx [2011/11/14 14:06] – created fsphil
+++ guides:apx [2011/11/19 00:38] (current) – [Packet Format] fsphil
@@ Line 6: / Line 6: @@
 ^ Offset ^ Name ^ Size ^ Description ^
-|  0 | Callsign   |  6 | Callsign of the user / payload. The format is described below |
+|   0 | Packet Type    |   1 | 0x76 - Position |
-|  6 | Timestamp  |  5 | UTC timestamp |
+|   1 | Callsign       |   6 | Callsign of the user / payload. The format is described below |
-| 11 | Latitude   |  4 | Latitude (-90 - 90 degrees) |
+|   7 | Timestamp      |   5 | UTC timestamp |
-| 15 | Longitude  |  4 | Longitude (-180 - 180 degrees) |
+|  12 | Latitude       |   4 | Latitude (-90 - 90 degrees, 0.000000042 degree accuracy, or ~0.46cm accuracy) |
-| 19 | Altitude   |  3 | Altitude (-100000 - 100000 metres) |
+|  16 | Longitude      |   4 | Longitude (-180 - 180 degrees, 0.000000084 degree accuracy, or ~0.93cm accuracy at the equator) |
-| 22 | Fix Status |  1 | 0 = No Fix, 1 = Fix, >= 2 undefined |
+|  20 | Altitude       |   3 | Altitude (-8388608 - 8388607 cm, or -83.8 - 83.8 km, two's compliment) |
-| 23 | Satellites |  1 | Number of satellites visible |
+|  23 | Fix Status     |   1 | 0 = No Fix, 1 = Fix, >= 2 undefined |
-| 24 | User data  |  4 | 32-bit user data |
+|  24 | PDOP           |   1 | Positional dilution of precision |
-| 28 | CRC        |  4 | 32-bit CRC |
+|  25 | Heading        |   1 | Heading (0 - 360 degrees, 1.4 degree accuracy) |
-| 32 | FEC        | 32 | Reed-Solomon forward error correction data. This may be omitted for storage, or if the mode already provides FEC |
+|  26 | Ground Speed   |   1 | Ground speed (0-100 m/s, 0.39 m/s accuracy) |
+|  27 | Vertical Speed |   1 | Vertical speed (0-100 m/s, 0.39 m/s accuracy) |
+|  28 | Checksum       |   4 | 32-bit CRC |
+|  32 | FEC            |  32 | Reed-Solomon forward error correction data. This may be omitted for storage, or if the mode already provides FEC |
 Sizes and offsets are in bytes, with each packet being 64 bytes in total (or 32 bytes with no FEC data).