* All from memory so quite likely to be incorrect*
HSP
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I remember when Igo first started to use HSP files it had its problems.
On a congested but flowing motorway it would direct you off at the next slip road exit and then bring you back on to the motorway at the very same junction ( a distance of 500 yards). This would sometimes happen at every junction.
Fortunately it has improved a lot since then.
Using HSP files definitely updated your route automatically. I remember driving a long route passing close to a number of cities.
Setting off at rush hour my route avoided most of the congested roads along the way. As I progressed and rush hour passed, Primo periodically recalculated my route and started using the roads that would of been previously congested.
TMC & TMC PRO
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As I think already stated by Buffen TMC pro is available in Germany though I think other premium services in other countries sometimes get referred to as TMC pro.
I think In Germany TMC is free but TMC pro is a paid for service both is transmitted on the same Frequency.
Here in the UK we have 2 licence fee services, ITTS & TRAFFIC MASTER as with a lot of countries this "one off" licence fee is paid for by the Sat nav manufacturers or the software companies like IGO.
ITTS (now owned by INRIX) and TRAFFICMASTER are broadcast on different frequencies and by different radio stations. TRAFFICMASTER, I find, has a better radio coverage of the UK and I always seem to get more traffic events.
Fortunately Primo is capable of receiving from both providers simultaneously.
HNR
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As stated already in this thread, HNR files were more of a benefit when we owned less powerful devices and would calculate and re calculate a route across Europe more quickly.
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