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aprs-android-messaging

Build

You must have the Android SDK and NDK set up.

./gradlew assembleDebug

Message Format

1111111 1231234E 121234N Message
Truncated unix time Longitude Latitude Message

Truncated unix time

  • Characters 0 - 6

  • The two most significant and the one least significant value is truncated. This provides 10 second time resolution and ~38 months before it overlaps.

  • Example:

    Unix time: 1504011673 Truncated unix time: 0401167

Longitude

  • Characters 7 - 14
  • 4 decimal precision. This provides ~11 meters resolution.
  • Degrees are always 3 digits with leading 0s when less than 100 or less than 10.
  • Decimal is dropped from the value.
  • E appended for East, W appended for West.

Latitude

  • Characters 15 - 21
  • 4 decimal precision. This provides ~11 meters resolution.
  • Degrees are always 2 digits with a leading 0 when less than 10.
  • Decimal is dropped from the value.
  • N appended for North, S appended for South.

Message

  • Characters 22 - 256
  • Message in ASCII characters

Acknowledgements

Based on code from PacketDroid and APRSdroid.

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