N900 GPS Reverse Engineering

S--- DL S-- | 00010 07 da 07 15 00 xx xx 00  xx xx 00 00 09 02 00 1c S- TL TS --       S | 00020  xx xx xx xx xx xx xx xx  00 00 xx xx 00 00 08 8b DL---      DL--- TS     S       S ^eph^ | 00030 xx 00 xx xx xx xx xx xx  09 04 00 14 62 7e xx xx             S- DL TS---    DL MS  S-- track SS--- | 00040 xx xx 00 xx xx xx 00 xx  00 xx 00 00 09 05 00 74 DL--- S-   TL    S- DS  S- DS S | 00050  09 00 00 00 00 02 xx xx  00 xx xx xx xx xx 00 00 S DL MS S- TS--- I  TS MI S | 00060  00 04 xx xx xx xx xx xx  xx xx 00 00 00 xx xx xx          S T3 TS S- TL TS MS  TS MD S--- DL TS--- | 00070 00 xx xx xx xx xx 00 00  00 xx xx xx 00 03 xx xx          S- TS--- I  TS MS S T3 MS MS S TS MS | 00080  xx xx 00 00 00 xx xx xx  00 xx xx xx xx xx 00 00 TS MD S--- T3 TS MS S- TS--- MS TS MI S | 00090  00 xx xx xx 00 03 xx xx  xx xx 00 00 00 xx xx xx          S- TS-- S TS MD  TS MS S--- TS SS+TS | 000a0 00 xx xx xx xx xx 00 00  00 xx xx xx 00 xx xx xx          S- TL TS MS TS MD S TS-- S- TL TS MI | 000b0  xx xx 00 00 00 xx xx xx  00 xx xx xx xx xx 00 00 TS--- S--- TS--- MS S- TS--- MI TS MS S | 000c0  09 08 00 0c xx xx xx xx  xx xx xx xx          S-- DL--
 * 00000 00 92 01 00 00 00 00 xx  05 00 00 00 09 03 00 10

S = Static, unchanging normally MS = Mostly static, varying in value normally slightly SS = Sometimes static, completely different values sometimes I = Incrementing MI = Incrementing, but not every packet D = Decrementing MD = Decrementing, but not every packet TS = Time-sensitive; changes over (short) durations of time TL = Time-sensitive, longer duration T3 = " DS = Distance-sensitive; changes over at least 30m distance DL = Distance-sensitive, like across the world; TEMP; *or* T4

19,1a = 0000-e678 (hex) 20 = 22,23 = 28 = 2b,2c = 0590-12a9 (hex) 2e,2f = eph (cm) 30 = 35 = 3c,3d = track: Direction of motion in hundredths of a degree 3e,3f = epd: Track accuracy (in hundredths?) 43 = 45 =