OpenADSB is an aircraft tracking app for iOS and iPadOS. By default it uses the ADS-B Exchange (adsbexchange.com) data feed, but it can be configured to connect to any dump1090, tar1090 or Virtual Radar Server. The app has a filter tool, with some pre configured options, like military aircraft only. Here are some additional filters you can use to watch UK emergency services aircraft. Add a new filter in OpenADSB and put the following strings into the “Registration” field

Show All Air Ambulances

G-CRWL,G-KRNO,G-TAAS,G-WNAS,G-PICU,G-TCAA,G-NICU,G-CPTZ,G-DAAS,G-DAAN,G-DSAA,G-RESU,G-HEMC,G-EHEM,G-HHEM,G-NHAC,G-NHAD,G-NHAE,G-GWAC,G-HIOW,G-KSST,G-KSSC,G-LNAC,G-KSSA,G-EHMS,G-LNDN,G-MGPS,G-RMAA,G-OMAA,G-HWAA,G-NWAA,G-NWAE,G-NWEM,G-SPHU,G-HEMZ,G-RSCU,G-SCAA,G-EMAA,G-ISAS,G-GSAS,G-SASC,G-SASD,G-TVLY,G-WENU,G-WOBR,G-WROL,G-WASC,G-WLTS,G-YORX,G-YAAA


Show All Police Aircraft

G-POLA,G-POLB,G-POLC,G-POLD,G-POLF,G-POLG,G-POLJ,G-POLH,G-POLX,G-POLV,G-POLW,G-POLZ,G-POLU,G-EMID,G-CPAO,G-NWOI,G-TVHB,G-CPAS,G-DCPB,G-MPSA,G-MPSB,G-MPSC,G-HEOI,G-SUFK,G-POLS


Show All Coastguard Search & Rescue

G-MCGI,G-MCGF,G-MCGE,G-MCGH,G-MCGZ,G-MCGY,G-MCGJ,G-MCGK,G-MCGG,G-MCGL,G-MCGP,G-MCGM,G-MCGS,G-MCGV,G-MCGW,G-MCGU,G-MCGO,G-MCGX,G-MCGR,G-MCGT,G-UASA,G-UASB,G-UASD,G-UASE