aismsg_18 Struct Reference

#include <vdm_parse.h>

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Detailed Description

AIS Message 18 - Standard Class B CS Position Report.

From IEC 62287. This differs slightly from the original message, some of the regional bits were changed to flags.

Data Fields
char	msgid
	6 bits : MessageID (18)
char	repeat
	2 bits : Repeated
unsigned long	userid
	30 bits : UserID / MMSI
unsigned char	regional1
	8 bits : Regional Bits
int	sog
	10 bits : Speed Over Ground
char	pos_acc
	1 bit : Position Accuracy
long	longitude
	28 bits : Longitude in 1/10000 minute
long	latitude
	27 bits : Latitude in 1/10000 minute
int	cog
	12 bits : Course Over Ground
int	true
	9 bits : True Heading
char	utc_sec
	6 bits : UTC Seconds
char	regional2
	2 bits : Regional Bits
char	unit_flag
	1 bit : Class B CS Flag
char	display_flag
	1 bit : Integrated msg14 Display Flag
char	dsc_flag
	1 bit : DSC Capability flag
char	band_flag
	1 bit : Marine Band Operation Flag
char	msg22_flag
	1 bit : Msg22 Frequency Management Flag
char	mode_flag
	1 bit : Autonomous Mode Flag
char	raim
	1 bit : RAIM Flag
char	comm_state
	1 bit : Comm State Flag
struct {
char   sync_state
	2 bits : SOTDMA Sync State
char   slot_timeout
	3 bits : SOTDMA Slot Timeout
int   sub_message
	14 bits : SOTDMA Sub-Message
}	sotdma
struct {
char   sync_state
	2 bits : ITDMA Sync State
int   slot_inc
	13 bits : ITDMA Slot Increment
char   num_slots
	3 bits : ITDMA Number of Slots
char   keep_flag
	1 bit : ITDMA Keep Flag
}	itdma

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Field Documentation

char aismsg_18::msgid

6 bits : MessageID (18)

char aismsg_18::repeat

2 bits : Repeated

unsigned long aismsg_18::userid

30 bits : UserID / MMSI

unsigned char aismsg_18::regional1

8 bits : Regional Bits

int aismsg_18::sog

10 bits : Speed Over Ground

char aismsg_18::pos_acc

1 bit : Position Accuracy

long aismsg_18::longitude

28 bits : Longitude in 1/10000 minute

long aismsg_18::latitude

27 bits : Latitude in 1/10000 minute

int aismsg_18::cog

12 bits : Course Over Ground

int aismsg_18::true

9 bits : True Heading

char aismsg_18::utc_sec

6 bits : UTC Seconds

char aismsg_18::regional2

2 bits : Regional Bits

char aismsg_18::unit_flag

1 bit : Class B CS Flag

char aismsg_18::display_flag

1 bit : Integrated msg14 Display Flag

char aismsg_18::dsc_flag

1 bit : DSC Capability flag

char aismsg_18::band_flag

1 bit : Marine Band Operation Flag

char aismsg_18::msg22_flag

1 bit : Msg22 Frequency Management Flag

char aismsg_18::mode_flag

1 bit : Autonomous Mode Flag

char aismsg_18::raim

1 bit : RAIM Flag

char aismsg_18::comm_state

1 bit : Comm State Flag

char aismsg_18::sync_state

2 bits : ITDMA Sync State

char aismsg_18::slot_timeout

3 bits : SOTDMA Slot Timeout

int aismsg_18::sub_message

14 bits : SOTDMA Sub-Message

struct { ... } aismsg_18::sotdma

int aismsg_18::slot_inc

13 bits : ITDMA Slot Increment

char aismsg_18::num_slots

3 bits : ITDMA Number of Slots

char aismsg_18::keep_flag

1 bit : ITDMA Keep Flag

struct { ... } aismsg_18::itdma

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The documentation for this struct was generated from the following file:

• /Users/brianlane/projs/aisparser/c/src/vdm_parse.h

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