[aivdm] Expand driver type=20 to handle length 186

Full parsing not guarenteed but it at least parses more of
the data that is pressent for several of these messages

there are 28 bits not being processed out of this message
but it doesn't match up with the 12+4+3+11=30 bits that
the repeated data set is currently using

Looks like other messages of type 20 have data in the
last 28 bits but it's not decoded anywhere right now

186 bits long
!AIVDM,1,1,,2,D02E34iFTg6D000000000000002gjG2,0*75
20|0|002442003|1385|2|7|1125|0|0|0|0|0|0|0|0|0|0|0|0

186 bits long
!AIVDM,1,1,,2,D02=VVA8`N?`>4N01L=Nfp1>AA0,0*75
20|0|002320025|1162|1|7|250|225|1|7|0|1475|5|7|750|19|9|0|1296

shorter
!AIVDM,1,1,,A,D028rqP<QNfp000000000000000,2*0C
20|0|002243302|200|5|7|750|0|0|0|0|0|0|0|0|0|0|0|0

1 files changed, 3 insertions, 0 deletions

diff --git a/test/sample.aivdm.ju.chk b/test/sample.aivdm.ju.chk
index 42eb3540..f650c9b7 100644
--- a/test/sample.aivdm.ju.chk
+++ b/test/sample.aivdm.ju.chk
@@ -90,3 +90,6 @@
 {"class":"AIS","device":"stdin","type":8,"repeat":0,"mmsi":2711009,"scaled":false,"dac":1,"fid":16,"data":"720:00025e8d136025bd890d5520b2ff0ac000000070202580430d4bbf003f000001027cc3302597b60d4b15003f000000c5c4a9802584cf0d3f45803f000000f47ba58025cdf40d4391003f0000010272bb00258e5f0d44f7c9ff0a"}

 {"class":"AIS","device":"stdin","type":21,"repeat":0,"mmsi":4000003,"scaled":false,"aid_type":30,"aid_type_text":"Special Mark","name":"IBC G BUOY","accuracy":true,"lon":75943336,"lat":22448680,"to_bow":2,"to_stern":2,"to_port":2,"to_starboard":2,"epfd":1,"epfd_text":"GPS","second":31,"regional":0,"off_position":false,"raim":false,"virtual_aid":false}

 {"class":"AIS","device":"stdin","type":16,"repeat":0,"mmsi":439952844,"scaled":false,"mmsi1":315920,"offset1":2049,"increment1":681,"mmsi2":230137673,"offset2":424,"increment2":419}

+{"class":"AIS","device":"stdin","type":20,"repeat":0,"mmsi":2442003,"scaled":false,"offset1":1385,"number1":2,"timeout1":7,"increment1":1125,"offset2":0,"number2":0,"timeout2":0,"increment2":0,"offset3":0,"number3":0,"timeout3":0,"increment3":0,"offset4":0,"number4":0,"timeout4":0,"increment4":0}

+{"class":"AIS","device":"stdin","type":20,"repeat":0,"mmsi":2320025,"scaled":false,"offset1":1162,"number1":1,"timeout1":7,"increment1":250,"offset2":225,"number2":1,"timeout2":7,"increment2":0,"offset3":1475,"number3":5,"timeout3":7,"increment3":750,"offset4":19,"number4":9,"timeout4":0,"increment4":1296}

+{"class":"AIS","device":"stdin","type":20,"repeat":0,"mmsi":2243302,"scaled":false,"offset1":200,"number1":5,"timeout1":7,"increment1":750,"offset2":0,"number2":0,"timeout2":0,"increment2":0,"offset3":0,"number3":0,"timeout3":0,"increment3":0,"offset4":0,"number4":0,"timeout4":0,"increment4":0}