Ship waypoints (WP) and/or route plan report

	Number of bits		Description
NWP	4		Number of next waypoints available (1-14);  0 = no next waypoint available = default; 15 = not used
WP i.Lon	28		Longitude of next waypoint i in 1/10 000 min (±180°, East = positive, West = negative). Field required if and as often as 1 ≤ i ≤ NWP, i = 1, 2, 3, …, 14;  field not required if NWP = 0
WP i.Lat	27		Latitude of next waypoint i in 1/10 000 min (±90°, North = positive, South = negative). Field required if and as often as 1 ≤ i ≤ NWP, i = 1, 2, 3, …, 14; field not required if NWP = 0
Route specified by textual description	120		Description of the route information in textual form, e.g. —West channel“; maximum 20 characters using 6-bit ASCII; @@@@@@@@@@@@@@@@@@@@ = not available (field must not be omitted)
Spare	NWP	Bits	Spare. Not used. Should be set to zero
	0, 8	4
	1, 9	5
	2, 10	6
	3, 11	7
	4, 12	0
	5, 13	1
	6, 14	2
	7	3
Number of bits	128-896		The number of bits of the IFM 17 may be calculated as follows: 124 + (NWP × 55) + spare

The number of slots used for this message depends on the number of next waypoints transmitted as
follows:

 

Number of next waypoints   transmitted	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14
Number of slots used for this   message	2	2	2	3	3	3	3	4	4	4	4	5	5	5	5