def decode_msg_19(bit_arr: bitarray) -> dict:
"""
Extended Class B CS Position Report
Src: https://gpsd.gitlab.io/gpsd/AIVDM.html#_type_19_extended_class_b_cs_position_report
"""
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),
'speed': get_int_from_data(46, 56) * 0.1,
'accuracy': bit_arr[56],
'lon': get_int_from_data(57, 85, signed=True) / 600000.0,
'lat': get_int_from_data(85, 112, signed=True) / 600000.0,
'course': get_int_from_data(112, 124) * 0.1,
'heading': get_int_from_data(124, 133),
'second': get_int_from_data(133, 139),
'regional': get_int_from_data(139, 143),
'shipname': encode_bin_as_ascii6(bit_arr[143:263]),
'shiptype': ShipType(get_int_from_data(263, 271)),
'to_bow': get_int_from_data(271, 280),
'to_stern': get_int_from_data(280, 289),
'to_port': get_int_from_data(289, 295),
'to_starboard': get_int_from_data(295, 301),
'epfd': EpfdType(get_int_from_data(301, 305)),
'raim': bit_arr[305],
'dte': bit_arr[306],
'assigned': bit_arr[307],
}
def decode_msg_21(bit_arr: bitarray) -> dict:
"""
Aid-to-Navigation Report
Src: https://gpsd.gitlab.io/gpsd/AIVDM.html#_type_21_aid_to_navigation_report
"""
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),
'aid_type': NavAid(get_int_from_data(38, 43)),
'name': encode_bin_as_ascii6(bit_arr[43:163]),
'accuracy': bit_arr[163],
'lon': get_int_from_data(164, 192, signed=True) / 600000.0,
'lat': get_int_from_data(192, 219, signed=True) / 600000.0,
'to_bow': get_int_from_data(219, 228),
'to_stern': get_int_from_data(228, 237),
'to_port': get_int_from_data(237, 243),
'to_starboard': get_int_from_data(243, 249),
'epfd': EpfdType(get_int_from_data(249, 253)),
'second': get_int_from_data(253, 259),
'off_position': bit_arr[259],
'regional': get_int_from_data(260, 268),
'raim': bit_arr[268],
'virtual_aid': bit_arr[269],
'assigned': bit_arr[270],
'name_extension': encode_bin_as_ascii6(bit_arr[272:]),
}
def decode_msg_5(bit_arr: bitarray.bitarray) -> Dict[str, Any]:
"""
Static and Voyage Related Data
Src: https://gpsd.gitlab.io/gpsd/AIVDM.html#_type_5_static_and_voyage_related_data
"""
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),
'ais_version': get_int_from_data(38, 40),
'imo': get_int_from_data(40, 70),
'callsign': encode_bin_as_ascii6(bit_arr[70:112]),
'shipname': encode_bin_as_ascii6(bit_arr[112:232]),
'shiptype': ShipType(get_int_from_data(232, 240)),
'to_bow': get_int_from_data(240, 249),
'to_stern': get_int_from_data(249, 258),
'to_port': get_int_from_data(258, 264),
'to_starboard': get_int_from_data(264, 270),
'epfd': EpfdType(get_int_from_data(270, 274)),
'month': get_int_from_data(274, 278),
'day': get_int_from_data(278, 283),
'hour': get_int_from_data(283, 288),
'minute': get_int_from_data(288, 294),
'draught': get_int_from_data(294, 302) / 10.0,
'destination': encode_bin_as_ascii6(bit_arr[302:422]),
'dte': bit_arr[-2]
}
def decode_msg_4(bit_arr: bitarray) -> dict:
"""
AIS Vessel position report using SOTDMA (Self-Organizing Time Division Multiple Access)
Src: https://gpsd.gitlab.io/gpsd/AIVDM.html#_type_4_base_station_report
"""
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(3, 38),
'year': get_int_from_data(38, 52),
'month': get_int_from_data(52, 56),
'day': get_int_from_data(56, 61),
'hour': get_int_from_data(61, 66),
'minute': get_int_from_data(66, 72),
'second': get_int_from_data(72, 78),
'accuracy': bit_arr[78],
'lon': get_int_from_data(79, 107, signed=True) / 600000.0,
'lat': get_int_from_data(107, 134, signed=True) / 600000.0,
'epfd': EpfdType(get_int_from_data(134, 138)),
'raim': bit_arr[148],
'radio': get_int_from_data(148, len(bit_arr)),
}
def decode_msg_5(bit_arr: bitarray) -> dict:
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),
'ais_version': get_int_from_data(38, 40),
'imo': get_int_from_data(40, 70),
'callsign': encode_bin_as_ascii6(bit_arr[70:112]),
'shipname': encode_bin_as_ascii6(bit_arr[112:232]),
'shiptype': ShipType(get_int_from_data(232, 240)),
'to_bow': get_int_from_data(240, 249),
'to_stern': get_int_from_data(249, 258),
'to_port': get_int_from_data(258, 264),
'to_starboard': get_int_from_data(264, 270),
'epfd': EpfdType(get_int_from_data(270, 274)),
'month': get_int_from_data(274, 278),
'day': get_int_from_data(278, 283),
'hour': get_int_from_data(283, 288),
'minute': get_int_from_data(288, 294),
'draught': get_int_from_data(294, 302) / 10.0,
'destination': encode_bin_as_ascii6(bit_arr[302:422]),
'dte': bit_arr[-2]
}