What do *you* do with AIS data? - Page 1
Forum section: electronics / rf-microwave

author: cdev
author_rank: Super Contributor
timestamp: November 24, 2020, 04:40:45 am
content: Suddenly I started picking it up, when before I didn't. Maybe I missed this AIS before it.; Its just gibberish to me. But I'd like to make some kind of displav. You never know when a cruise liner or the Queen Carlotta might show up in the front yard, I suppose. Time to fill up the moat.Apart from some rinky dink boats used in recreation, the nearest navigable waters are maybe 7-10 miles away.!AIVDM,1,1,,B,?03Owp1GaasPD00,0*40!AIVDM,1,1,,B,D03Owohs=N>4g<fGLfpNfp0,0*1F!AIVDM,1,1,,A,D03Owp0<EN>40DfGL00Nfp0,0*55!AIVDM,1,1,,B,?03Owp1I924PD00,0*02!AIVDM,1,1,,A,D03Owp0s=N>4g<fGLfpNfp0,0*5B!AIVDM,1,1,,B,?03Owp0sO=8PD00,0*4C!AIVDM,1,1,,B,?03Owp1HRBU0D00,0*19!AIVDM,1,1,,B,403Owp1vBsEQDre:gPGDtE?02H;p,0*6A!AIVDM,1,1,,B,D03Owp1T1N>5NHfGMMhNfp0,0*1C!AIVDM,1,1,,B,403Owp1vBsEl0re:h2GDtMO02<3@,0*7A!AIVDM,1,1,,B,?03Owp1GO3bhD00,0*15!AIVDM,1,1,,B,403Owp1vBsEr0re:gtGDtMO02D3<,0*29!AIVDM,1,1,,B,403Owp1vBsF<`re:gBGDtJw02L3=,0*34!AIVDM,1,1,,B,D03Owp06AN>40`fGL00Nfp0,0*7C!AIVDM,1,1,,B,403Owp1vBsFFDre:g0GDtEg02D35,0*07!AIVDM,1,1,,B,D03Owp1T1N>5NHfGMMhNfp0,0*1C!AIVDM,1,1,,B,403Owp1vBsFL0re:hHGDtHO02L39,0*2F!AIVDM,1,1,,A,D03Owp0s=N>4g<fGLfpNfp0,0*5B!AIVDM,1,1,,B,403Owp1vBsFQDre:fpGDtJw028;p,0*7F!AIVDM,1,1,,B,403Owp1vBsFb`re:gBGDtKw026j`,0*15!AIVDM,1,1,,B,?03Owp1ijC5hD00,0*39!AIVDM,1,1,,B,403Owp1vBsFg0re:flGDtK?02@0:,0*51!AIVDM,1,1,,B,D03Owp06AN>40`fGL00Nfp0,0*7C!AIVDM,1,1,,B,D03Owp1T1N>5NHfGMMhNfp0,0*1C!AIVDM,1,1,,B,?03OwoiGgI;@D00,0*71!AIVDM,1,1,,B,D03Owohs=N>4g<fGLfpNfp0,0*1F!AIVDM,1,1,,B,403Owp1vBsGa0re:fjGDtGO02H0:,0*24!AIVDM,1,1,,B,?03Owp1:9ipPD00,0*6E!AIVDM,1,1,,B,D03Owp1T1N>5NHfGMMhNfp0,0*1C!AIVDM,1,1,,B,?03OwoiGIiu0D00,0*41!AIVDM,1,1,,B,D03Owp06AN>40`fGL00Nfp0,0*7C!AIVDM,1,1,,B,403Owp1vBsGl0re:g6GDtGw02<36,0*37!AIVDM,1,1,,B,403Owp1vBsGn`re:fhGDtFw026sH,0*0F!AIVDM,1,1,,B,403Owp1vBsGoDre:fvGDtJO020S:,0*54!AIVDM,1,1,,A,?03Owp1H0OOPD00,0*0F!AIVDM,1,1,,B,403Owp1vBsP1Dre:fvGDtHg028;p,0*1D!AIVDM,1,1,,A,403Owp1vBsP2Dre:fdGDtCw028;n,0*0A!AIVDM,1,1,,A,403Owp1vBsP>Dre:fpGDtGw02H;n,0*66!AIVDM,1,1,,A,403Owp1vBsP>`re:flGDtHw02HGT,0*17!AIVDM,1,1,,B,403Owp1vBsP?`re:fvGDtIg02@GV,0*14!AIVDM,1,1,,B,D03Owoib5N>5N4fGMMhNfp0,0*15!AIVDM,1,1,,B,?03OwoiGO@EHD00,0*26!AIVDM,1,1,,A,D03Owp0s=N>4g<fGLfpNfp0,0*5B!AIVDM,1,1,,B,?03OwoiGbt=hD00,0*67!AIVDM,1,1,,A,403Owp1vBsQ60re:fVGDtJO02808,0*25!AIVDM,1,1,,A,D03Owp0s=N>4g<fGLfpNfp0,0*5B!AIVDM,1,1,,A,D03Owp0s=N>4g<fGLfpNfp0,0*5B!AIVDM,1,1,,A,403Owp1vBsQN0re:fFGDtIg02808,0*66!AIVDM,1,1,,B,18ISkh001rrdwi:G@1KnKU2T0<2l,0*7D!AIVDM,1,1,,A,D03Owp0<EN>40DfGL00Nfp0,0*55!AIVDM,1,1,,B,?03Owp1Ga5cPD00,0*04!AIVDM,1,1,,A,403Owp1vBsQj`re:gBGDtEw02HGT,0*60!AIVDM,1,1,,A,403Owp1vBsR>`re:gBGDtFO02HGT,0*0C!AIVDM,1,1,,B,403Owp1vBsRD`re:ftGDtFw02L2o,0*30!AIVDM,1,1,,A,D03Owoh6AN>40HfGL00Nfp0,0*10!AIVDM,1,1,,A,403Owp1vBsRG0re:gLGDtEw02D2o,0*52!AIVDM,1,1,,B,403Owp1vBsRHDre:g<GDtGO02<2o,0*18!AIVDM,1,1,,B,?03Owoj6w=;PD00,0*77!AIVDM,1,1,,B,D03Owoh<EN>40DfGL00Nfp0,0*11!AIVDM,1,1,,B,38K@A:000MJdVUTGAc6lsqWn05gk,0*57!AIVDM,1,1,,B,403Owp1vBsRSDre:gbGDtD?020S:,0*16!AIVDM,1,1,,A,403Owp1vBsRb`re:fnGDtHw028GT,0*3B!AIVDM,1,1,,B,D03Owohs=N>4g<fGLfpNfp0,0*1F!AIVDM,1,1,,B,?03Owoi@`aPhD00,0*1A!AIVDM,1,1,,B,15C@tr0014Jdap4GAhSh`PQ`04CT,0*6D!AIVDM,1,1,,A,15C@tr0012Jdau`GAjg0N@Hd0H<@,0*63!AIVDM,1,1,,A,15C@tr0P@sJdap<GArjuHJ`d0@<@,0*16!AIVDM,1,1,,A,403Owp1vBsS0`re:g:GDtAg020S:,0*56!AIVDM,1,1,,B,403Owp1vBsS9Dre:hFGDt@w02H;p,0*40!AIVDM,1,1,,B,403Owp1vBsS=Dre:f`GDtA?028;p,0*55!AIVDM,1,1,,B,403Owp1vBsS?Dre:fdGDtFO020S:,0*0E!AIVDM,1,1,,B,?03OwohkCJc0D00,0*53!AIVDM,1,1,,B,?03OwoiGgI;@D00,0*71!AIVDM,1,1,,B,D03Owp1T1N>5NHfGMMhNfp0,0*1C!AIVDM,1,1,,B,?03Owoi@VUJPD00,0*3A!AIVDM,1,1,,B,403Owp1vBsSEDre:fbGDtDg028;p,0*72!AIVDM,1,1,,B,?03Owp1GKl1HD00,0*3D!AIVDM,1,1,,B,D03Owohs=N>4g<fGLfpNfp0,0*1F!AIVDM,1,1,,B,D03Owp06AN>40`fGL00Nfp0,0*7C!AIVDM,1,1,,B,?03Owoi@`aPhD00,0*1A!AIVDM,1,1,,B,403Owp1vBsSNDre:f<GDtF?024Ip,0*03!AIVDM,1,1,,B,?03Owp2G`p<tD00,0*38!AIVDM,1,1,,B,D03Owp1T1N>5NHfGMMhNfp0,0*1C!AIVDM,1,1,,B,15Mu1aP01FrdsutG@LGRU7rd0<1f,0*4B!AIVDM,1,1,,A,D03Owp1b5N>5N4fGMMhNfp0,0*51!AIVDM,1,1,,B,?03Owoi@`aPhD00,0*1A!AIVDM,1,1,,B,403Owp1vBsSS`re:f>GDtGO02@GV,0*15!AIVDM,1,1,,B,403Owp1vBsSU`re:fNGDtEw028GV,0*21!AIVDM,1,1,,B,?03OwohnkvgPD00,0*26!AIVDM,1,1,,B,D03Owp06AN>40`fGL00Nfp0,0*7C!AIVDM,1,1,,B,?03Owoj6w=;PD00,0*77!AIVDM,1,1,,B,?03Owp1GO3bhD00,0*15!AIVDM,1,1,,B,?03Owoi@cAgLD00,0*2A!AIVDM,1,1,,B,403Owp1vBsSd0re:fTGDtCg02<2d,0*0F!AIVDM,1,1,,B,403Owp1vBsSeDre:fvGDt>?028;p,0*64!AIVDM,1,1,,B,38K@A:0OiaJdtL8G@UR4@SUL00tP,0*1D!AIVDM,1,1,,B,403Owp1vBsSj0re:f>GDtGg02D2c,0*10!AIVDM,1,1,,B,403Owp1vBsSk0re:fFGDtCO02@0:,0*1A!AIVDM,1,1,,B,?03Owp1GP6E`D00,0*20!AIVDM,1,1,,B,?03OwoiGO@EHD00,0*26!AIVDM,1,1,,B,403Owp1vBsSl0re:fRGDtHw02<2c,0*1D!AIVDM,1,1,,B,D03Owohs=N>4g<fGLfpNfp0,0*1F!AIVDM,1,1,,B,?03Owp1GROwHD00,0*41!AIVDM,1,1,,B,D03Owoh<EN>40DfGL00Nfp0,0*11!AIVDM,1,1,,B,?03Owp1Ga>5`D00,0*69!AIVDM,1,1,,B,D03Owp06AN>40`fGL00Nfp0,0*7C!AIVDM,1,1,,B,D03Owoh<EN>40DfGL00Nfp0,0*11!AIVDM,1,1,,B,403Owp1vBsSs0re:ffGDtFg02@0:,0*0F!AIVDM,1,1,,B,?03Owp1GO3bhD00,0*15!AIVDM,1,1,,B,403Owp1vBsT0Dre:fvGDtE?02<2g,0*57!AIVDM,1,1,,B,D03Owohs=N>4g<fGLfpNfp0,0*1F!AIVDM,1,1,,B,403Owp1vBsT1`re:f`GDtHO028GV,0*59!AIVDM,1,1,,B,?03OwoiI4=NPD00,0*3D!AIVDM,1,1,,B,D03Owoh<EN>40DfGL00Nfp0,0*11!AIVDM,1,1,,B,403Owp1vBsT5Dre:g>GDtFO02H;p,0*02!AIVDM,1,1,,A,403Owp1vBsT6Dre:flGDtD?02H;n,0*3D!AIVDM,1,1,,B,403OwoivBsT70rdhRTG>oUw024PL,0*5E!AIVDM,1,1,,B,?03Owp26D5JPD00,0*7A!AIVDM,1,1,,B,403Owp1vBsT90re:fnGDtEO0280:,0*19!AIVDM,1,1,,B,D03Owohs=N>4g<fGLfpNfp0,0*1F!AIVDM,1,1,,B,403Owp1vBsT:`re:fnGDtGO024P`,0*7E!AIVDM,1,1,,B,403Owp1vBsT;Dre:fjGDtHw020S:,0*35!AIVDM,1,1,,A,D03Owp0s=N>4g<fGLfpNfp0,0*5B!AIVDM,1,1,,B,D03Owp0m9N>4gPfGLfpNfp0,0*2E!AIVDM,1,1,,B,?03Owoi:9ipPD00,0*29!AIVDM,1,1,,B,D03Owp1T1N>5NHfGMMhNfp0,0*1C!AIVDM,1,1,,B,?03Owp1GP6FpD00,0*33!AIVDM,1,1,,A,403Owp1vBsTFDre:epGDtBO02H;n,0*24!AIVDM,1,1,,B,403Owp1vBsTGDre:erGDtHg02@;p,0*10!AIVDM,1,1,,B,?03Owoi@cAgLD00,0*2A!AIVDM,1,1,,B,D03Owoib5N>5N4fGMMhNfp0,0*15!AIVDM,1,1,,B,?03OwojG`pHDD00,0*3B!AIVDM,1,1,,B,403Owp1vBsTIDre:fpGDtGg028;p,0*68!AIVDM,1,1,,B,?03OwoiGgrE8D00,0*4C!AIVDM,1,1,,B,?03OwoiGgHS@D00,0*18!AIVDM,1,1,,B,?03Owp1Gaeb@D00,0*45!AIVDM,1,1,,A,403Owp1vBsTL`re:fbGDtH?020S:,0*25!AIVDM,1,1,,A,403Owp1vBsTM0re:f@GDtG?02L2c,0*1D!AIVDM,1,1,,B,?03OwoiGOvJHD00,0*1F!AIVDM,1,1,,B,D03Owohs=N>4g<fGLfpNfp0,0*1F!AIVDM,1,1,,A,403Owp1vBsTNDre:etGDtHg02H;n,0*0A!AIVDM,1,1,,B,D03Owp06AN>40`fGL00Nfp0,0*7C!AIVDM,1,1,,B,D03Owohs=N>4g<fGLfpNfp0,0*1F!AIVDM,1,1,,A,403Owp1vBsTQ`re:erGDtIg02<2d,0*41!AIVDM,1,1,,A,403Owp1vBsTR0re:evGDtIg02808,0*4C!AIVDM,1,1,,B,D03Owp0m9N>4gPfGLfpNfp0,0*2E!AIVDM,1,1,,B,?03OwojG`pHDD00,0*3B!AIVDM,1,1,,B,?03OwoiGOvThD00,0*21!AIVDM,1,1,,B,?03OwoiGOv6DD00,0*6F!AIVDM,1,1,,A,403Owp1vBsTU`re:ebGDtMO02L2b,0*0F!AIVDM,1,1,,B,?03Owoi@a?vDD00,0*4F!AIVDM,1,1,,B,D03Owoib5N>5N4fGMMhNfp0,0*15!AIVDM,1,1,,B,D03Owp0m9N>4gPfGLfpNfp0,0*2E!AIVDM,1,1,,B,D03Owohs=N>4g<fGLfpNfp0,0*1F!AIVDM,1,1,,B,D03Owoib5N>5N4fGMMhNfp0,0*15!AIVDM,1,1,,B,403Owp1vBsTaDre:d6GDtNO028;p,0*25!AIVDM,1,1,,B,403Owp1vBsTbDre:dnGDtL?024R`,0*79!AIVDM,1,1,,B,D03Owp0m9N>4gPfGLfpNfp0,0*2E!AIVDM,1,1,,B,?03OwohulMoPD00,0*09!AIVDM,1,1,,B,D03Owoh<EN>40DfGL00Nfp0,0*11!AIVDM,1,1,,A,D03Owp0s=N>4g<fGLfpNfp0,0*5B!AIVDM,1,1,,B,D03Owohs=N>4g<fGLfpNfp0,0*1F!AIVDM,1,1,,B,?03OwohnkvgPD00,0*26!AIVDM,1,1,,B,?03Owoi@cDutD00,0*05!AIVDM,1,1,,B,?03Owp1GP6E`D00,0*20!AIVDM,1,1,,B,D03Owoib5N>5N4fGMMhNfp0,0*15------The next day, added a pebuilt LNA. Antenna is a whip style RTLSDRversio3 like magmount antenna, extended all the way which is very close to the ideal for 162 MHz..!AIVDM,1,1,,B,403Owp1vBt5>0re:fJGDtL?024`p,0*33!AIVDM,1,1,,B,403Owp1vBt5>Dre:f@GDtI?024`p,0*48!AIVDM,1,1,,B,D03Owp0m9N>4gPfGLfpNfp0,0*2E!AIVDM,1,1,,A,403Owp1vBt5>`re:fnGDtIO028GT,0*3E!AIVDM,1,1,,B,13U25<0002re1qPG??`PS8GB0<2i,0*02!AIVDM,1,1,,B,D03Owp0m9N>4gPfGLfpNfp0,0*2E!AIVDM,1,1,,B,D03Owohs=N>4g<fGLfpNfp0,0*1F!AIVDM,1,1,,B,403Owp1vBt5?`re:fFGDtHw020S:,0*5F!AIVDM,1,1,,B,403Owp1vBt5@0re:fRGDtIg02L2m,0*3F!AIVDM,1,1,,A,?03Owp20AAEDD00,0*15!AIVDM,1,1,,B,D03Owoib5N>5N4fGMMhNfp0,0*15!AIVDM,1,1,,A,403Owp1vBt5@Dre:f<GDtIg020S:,0*6C!AIVDM,1,1,,B,403Owp1vBt5@Dre:f@GDtIg02L2m,0*59!AIVDM,1,1,,B,?03Owp1GVw?8D00,0*45!AIVDM,1,1,,B,D03Owp0m9N>4gPfGLfpNfp0,0*2E!AIVDM,1,1,,B,D03Owp06AN>40`fGL00Nfp0,0*7C!AIVDM,1,1,,B,D03Owoib5N>5N4fGMMhNfp0,0*15!AIVDM,1,1,,B,403Owp1vBt5ADre:fHGDtIg02H;p,0*40!AIVDM,1,1,,B,?03Owp1GP6E`D00,0*20!AIVDM,1,1,,B,403Owp1vBt5A`re:f4GDtIw02HGV,0*52!AIVDM,1,1,,B,?03Owp1GOv6DD00,0*28!AIVDM,1,1,,B,D03Owoh<EN>40DfGL00Nfp0,0*11!AIVDM,1,1,,B,403Owp1vBt5B0re:fFGDtJO02D2q,0*16!AIVDM,1,1,,B,D03Owp1T1N>5NHfGMMhNfp0,0*1C!AIVDM,1,1,,B,?03Owp1:9ipPD00,0*6E!AIVDM,1,1,,A,403Owp1vBt5B`re:etGDtKO02HGT,0*29!AIVDM,1,1,,B,?03Owp1H6Q?0D00,0*04!AIVDM,1,1,,B,?03OwoiGb=jPD00,0*41!AIVDM,1,1,,B,D03Owp06AN>40`fGL00Nfp0,0*7C!AIVDM,1,1,,B,403Owp1vBt5C0re:g2GDtHw02@0:,0*15!AIVDM,1,1,,B,D03Owp1T1N>5NHfGMMhNfp0,0*1C!AIVDM,1,1,,B,D03Owoib5N>5N4fGMMhNfp0,0*15!AIVDM,1,1,,B,403Owp1vBt5CDre:gNGDtD?02@;p,0*18!AIVDM,1,1,,B,?03Owp1GVd@8D00,0*29!AIVDM,1,1,,B,D03Owp0m9N>4gPfGLfpNfp0,0*2E!AIVDM,1,1,,B,403Owp1vBt5D0re:fBGDtH?02<2o,0*00!AIVDM,1,1,,B,D03Owp1T1N>5NHfGMMhNfp0,0*1C!AIVDM,1,1,,B,403Owp1vBt5DDre:fPGDtHg02<2p,0*21!AIVDM,1,1,,B,?03Owp18FL`PD00,0*26!AIVDM,1,1,,B,D03Owp0m9N>4gPfGLfpNfp0,0*2E!AIVDM,1,1,,B,D03Owohs=N>4g<fGLfpNfp0,0*1F!AIVDM,1,1,,B,403Owp1vBt5D`re:fnGDtGw02<2p,0*24!AIVDM,1,1,,B,?03OwoiHRBU0D00,0*5E!AIVDM,1,1,,B,?03OwoiGbt=hD00,0*67!AIVDM,1,1,,A,403Owp1vBt5E0re:ftGDtF?02<2o,0*3A!AIVDM,1,1,,B,403Owp1vBt5EDre:h2GDtEg028;p,0*4C!AIVDM,1,1,,B,D03Owp0m9N>4gPfGLfpNfp0,0*2E!AIVDM,1,1,,B,D03Owp06AN>40`fGL00Nfp0,0*7C!AIVDM,1,1,,A,403Owp1vBt5F0re:g2GDtFO02808,0*5F!AIVDM,1,1,,B,403Owp1vBt5F0re:g8GDtEg024aH,0*50!AIVDM,1,1,,B,?03OwoiGc4<HD00,0*07!AIVDM,1,1,,B,403Owp1vBt5F`re:fJGDtJ?024aH,0*24!AIVDM,1,1,,B,D03Owp06AN>40`fGL00Nfp0,0*7C!AIVDM,1,1,,A,403Owp1vBt5G0re:f`GDtFg024aL,0*0C!AIVDM,1,1,,B,403Owp1vBt5G0re:f`GDtFg020S:,0*4F!AIVDM,1,1,,B,?03OwoiGh>;8D00,0*71!AIVDM,1,1,,B,16LUU20shoJdb4>GApHer:n808:5,0*1C!AIVDM,1,1,,B,D03Owoib5N>5N4fGMMhNfp0,0*15!AIVDM,1,1,,B,?03Owp1GgHS@D00,0*5F--They are now coming in several a second with the LNA. Wow.Will try to get a setup to graph where they are.I was not expecting so many to be received.

author: fourfathom
author_rank: Super Contributor
timestamp: November 24, 2020, 05:07:42 am
content: Quote from: cdev on November 24, 2020, 04:40:45 amPicking it up *how*? An AIS receiver? Via the internet? Anyway, there are marine navigation programs that will take an AIS input (serial port or network) and display the target ships, positioned on a chart. These will show all the information included in the AIS transmissions. Look for OpenCPN and qtVlm. There are many others, but those are what I use, as well as my NavMonPc (which is looking pretty dated these days but can still be useful).You can also feed your AIS receivers messages to internet hubs such as marinetraffic.com and aishub.net -- If you send these guys your signals you can usually get some sort of combined worldwide feed back from them, that you can uses as you like. Marinetraffic.com and other sites also do a very good job of showing you the global AIS traffic.Yes, that raw data looks complicated. It uses a six-bit dataword, encoded as ASCII characters. The specs are available. I wrote my own decoders and encoders in C#, and a long time ago in VisualBasic. Let me know if you need help.Here is what your AIS data contained (see image). There are several types of messages a vessel can send, and the ones that contain vessel name, callsign, dimensions, destination, etc. are sent less often. None of these were contained in your post, so all we got were position, course, and speed.

author: fourfathom
author_rank: Super Contributor
timestamp: November 24, 2020, 04:23:22 pm
content: Quote from: cdev on November 24, 2020, 05:35:01 amVHF propagation can surprise you (AIS is around 162 MHz). I have two receiving sites, one about 1000 ft elevation with a good ocean view to the west (near San Francisco). I generally receive out to the horizon and a bit beyond, but when tropospheric ducting happens I can receive stations 2000 miles away. There is also diffraction that lets me receive signals from the far side of local hills. My other receiving site is in Friday Harbor, WA, and due to the location and surroundings there the range is much less.Your second set of AIS messages gave you these targets (see image). Again, no "extended" sentences were received (those are the ones with the extra ship data). You can always grab the "MMSI" vessel identification number and look up the particulars. Plug the MMSI into marinetraffic.com and usually has nice photos of the vessel. There are other places to look up the MMSI, such as the official ITU site (https://www.itu.int/mmsapp/ShipStation/list), and the FCC site (https://wireless2.fcc.gov/UlsApp/UlsSearch/searchShip.jsp).

author: cdev
author_rank: Super Contributor
timestamp: November 26, 2020, 01:15:16 am
content: I now have it working fairly well with several different programs and am receiving a lot of what appear to be larger boats in NY harbor. Since all the signals are to the east of me, I am thinking of building a small 3 element Yagi. This reception is surprising to me because I am actually on a (very) small hill in an area that's a bit too low to see the NYC skyline unless I hike and climb a bit. I suspect the ability to catch these signals is dependent on the season being winter- the ridge to my east is covered with trees that I suspect usually eat up those signals.This traffic is much less than it appears because a few senders appear to be base stations that are there all the time.*Actually, thinking about it, when I put some energy into it (tweaking antenna to optimize it) I have commonly in received NOAA stations from very far to my east.. CT, I've received at least two CT stations that are quite far away, and one of them is on Long Island Sound, at least halfway across the state. Thats probably much farther than I would receive if I was lower down. There must be some diffraction going on, still. Also once I heard a station in RI. So building a better antenna might be fun as it gives me an opportunity to measure propagation under different conditions. Both climactic and seasonal.Where in the San Francisco area is your receiver there?I know the hiking in the SF Bay Area pretty well.. Actually much better than here..(Unrelated: looking through my old phone book the other day I realized that I used to know a younger Pease fellow there, who was quite an avid hiker, must run in the 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author: fourfathom
author_rank: Super Contributor
timestamp: November 26, 2020, 05:39:11 am
content: Your last batch of received AIS contained position reports for seven vessels, and two base stations. It also contained the "static" report from the vessel "MSC ANCHORAGE", but since there was no position report received I show the position (etc) as "zero" (see image).My Bay Area station is in my barn a few miles inland from Bodega Bay (about 50 miles north of the Golden Gate Bridge). I am using a marine whip antenna, feeding a "dAISy" single-channel receiver connected to a Raspberry Pi. The dAISy isn't the best AIS receiver, but is cheap and it works well enough for reporting. Elsewhere I use a 2-channel SR-162 receiver, or on my boats a full Class-B AIS transponder. Most marine whips are optimized for VHF#16, but I can trim the low-gain whips up in frequency a bit. This isn't really critical unless you are trying for AIS DX.AIS has definitely been a good propagation survey tool, at least over the oceans! Since I started monitoring, ham radio WSPR and other digital beacon modes have become the propagation measurement tools of choice, but there aren't many marine beacon stations (there are an occasional few) so AIS still has it's survey value.

author: cdev
author_rank: Super Contributor
timestamp: November 28, 2020, 12:45:46 am
content: I've been there quite a few times!Where is the restaurant with the huge sharks jaws mounted on the wall, do you know the one I mean? It might have been on the Bodega Bay side of Drakes Bay, not in Bodega Bay proper.One of my favorite places in the Bay Area is Point Reyes, I used to go hiking there a lot. Several times every year. I really miss the hiking around there.Quote from: fourfathom on November 26, 2020, 05:39:11 amThinking about it I am surprised I pick up any of it at all here. I am actually quite a distance from NYC harbor and plus I am more than a little up but also behind not one but two substantial hills.So the signals I do pick up must be strong ones. Quite possibly on big ships.

author: fourfathom
author_rank: Super Contributor
timestamp: November 28, 2020, 02:38:17 am
content: Quote from: cdev on November 28, 2020, 12:45:46 amNot sure about the restaurant, we go to a couple in Bodega Bay, and used to go to a few on Tomales Bay (between Drakes and Bodega). It's been quite a while though. We still hike at Pt. Reyes, when we are in the area (before COVID, anyway).Quote from: cdev on November 28, 2020, 12:45:46 amBig ships use Class-A transponders, which transmit at 12.5W, and the antennas are usually up high and well-situated. Pleasure craft are more likely to use Class-B, which transmits less often, and at 2W (or slightly higher power with the latest generation of Class-B units), and the antennas are usually lower in elevation. From my Bodega Bay location I have Mt. Tamalpais between me and much of the San Francisco Bay, and I still pick up lots of vessels. There are some fairly consistent dead zones though. Interestingly, both Class-A and Class-B AIS are regularly received by satellites, giving fairly good worldwide coverage. You can pay for various levels of access to the satellite reception through Marinetraffic.com.

author: cdev
author_rank: Super Contributor
timestamp: November 29, 2020, 01:27:49 am
content: Wow, getting info on those ships in the bigger "dead zones" will cost ya!

author: fourfathom
author_rank: Super Contributor
timestamp: November 29, 2020, 01:41:32 am
content: Quote from: cdev on November 29, 2020, 01:27:49 amYes, satellite AIS coverage can be very expensive. But if you search for it, marinetraffic has a fairly low-cost option for tracking via satellite (about $16 per month for one vessel, more for additional vessels). I sometimes sign up for that when tracking an ocean-crossing sailboat that has a friend on it.

author: cdev
author_rank: Super Contributor
timestamp: November 29, 2020, 02:09:31 am
content: I have several copies of a classic book on Unix and Linux system administration, written by the great Evi Nemeth, who quite unfortunately was a member of the crew of the Nina, which disappeared without a trace quite some distance from New Zealand in a part of the Pacific that has little in the way of land for thousands of miles.This happened in 2013. So I can see how that kind of tracking might be very useful. It still blows me away how that airliner could have vanished without a trace. While looking for AIS stuff yesterday I stumbled across a bunch of these strange stories. I guess they must be as old as seafaring itself.Quite a tradition!

author: fourfathom
author_rank: Super Contributor
timestamp: November 29, 2020, 03:23:40 am
content: Quote from: cdev on November 29, 2020, 02:09:31 amYes, ships and planes still vanish without a trace, just not as often. It's a very big planet. Satellite AIS reception is a fairly new thing, and was not part of the initial AIS system plans. I believe it was bit of a surprise that it works at all. It still has issues with weak signals (the shipboard antennas generally have a null straight up), and there are AIS timeslot collisions when the ships are operating independently and not as part of a local network that is synchronized by base stations."ADS-B" is a recent system for aircraft and has many similarities to AIS. There are significant differences too. ADS-B will probably further reduce the number of "lost without a trace" aircraft accidents. As with AIS, anyone can put up a receiver for ADS-B and track local air traffic. You can also send your received ADS-B messages to "flightaware" (https://flightaware.com/adsb/) to improve the coverage of their receiver network.

author: cdev
author_rank: Super Contributor
timestamp: December 01, 2020, 12:04:20 am
content: Its amazing the power of radio to bridge very long distances with very little power sometimes, both VHF/UHF line of sight and other propagation modes. ADS-B reception here, because of the very large numbers of aircraft landing and taking off around here at all times, is just wild. At night much less so, but still there are always multiple planes in the sky.On the other hand, I guess I have to face reality that the AIS reception is piss poor here in my area. Some times of the day (evening)it seems as if from where I am I see more. Maybe there are just ships being moved back to their berths at that time and closer???But that's to be expected, I suppose. Maybe in the summer I will see some pleasure boats on my local river. But not many. I'm too far away from the ocean for it to be very deep most of the time. And my local creek unfortunately is not navigable. (except for fish!)I guess I can always wait a few centuries, then I will probably have an ocean right nearby. (If the water keeps rising.)You being up 1000 feet have nothing to worry about, however!I miss Northern California sometimes. Especially the coast, mountains, redwoods, spectacular views, fresh air smells, and hiking the trails.