def decode_msg_27(bit_arr: bitarray.bitarray) -> typing.Dict:
"""
Long Range AIS Broadcast message
Src: https://gpsd.gitlab.io/gpsd/AIVDM.html#_type_27_long_range_ais_broadcast_message
"""
get_int_from_data = partial(get_int, bit_arr)
return {
'type': get_int_from_data(0, 6),
'repeat': get_int_from_data(8, 8),
'mmsi': get_int_from_data(8, 38),
'accuracy': bit_arr[38],
'raim': bit_arr[39],
'status': NavigationStatus(get_int_from_data(40, 44)),
'lon': get_int_from_data(44, 62, signed=True) / 600.0,
'lat': get_int_from_data(62, 79, signed=True) / 600.0,
'speed': get_int_from_data(79, 85),
'course': get_int_from_data(85, 94),
'gnss': bit_arr[94],
}
def decode_msg_1(bit_arr: bitarray) -> dict:
"""
AIS Vessel position report using SOTDMA (Self-Organizing Time Division Multiple Access)
Src: https://gpsd.gitlab.io/gpsd/AIVDM.html#_types_1_2_and_3_position_report_class_a
"""
get_int_from_data = partial(get_int, bit_arr)
return {
'type': get_int_from_data(0, 6),
'repeat': get_int_from_data(6, 8),
'mmsi': get_int_from_data(8, 38),
'status': NavigationStatus(get_int_from_data(38, 42)),
'turn': get_int_from_data(42, 50, signed=True),
'speed': get_int_from_data(50, 60) / 10.0,
'accuracy': bit_arr[60],
'lon': get_int_from_data(61, 89, signed=True) / 600000.0,
'lat': get_int_from_data(89, 116, signed=True) / 600000.0,
'course': get_int_from_data(116, 128) * 0.1,
'heading': get_int_from_data(128, 137),
'second': get_int_from_data(137, 143),
'maneuver': ManeuverIndicator(get_int_from_data(143, 145)),
'raim': bit_arr[148],
'radio': get_int_from_data(149, bit_arr.length()),
}
def test_nav_status(self):
self.assertEqual(NavigationStatus(3), NavigationStatus.RestrictedManoeuverability)
self.assertEqual(NavigationStatus(17), NavigationStatus.Undefined)