//File 1.1 - On A Loose Leash//

What do you do next?

Yes, two-way communication, unless Hotaru chooses to terminate the communication link, or mute it on his end.
Hmm, yes I would suppose that an airport has VR Matrix facilities, the futuristic equivalent of today's online gaming or business centres, in the form of some rooms or some booths.
A taxi from Narita airport to the Tengu Corp office should run 60-80nY. A maglev subway train 30nY, an airport shuttle a bit more, 45nY. The shuttle only drops off at selected locations, such as district centres, tourist spots, shopping centres, hotels. Both the train and the shuttle drop off points should be roughly the same distance to the office, which would require another 10 minutes of walking.

Just to detail how I imagine the 'science' works with your gear. I don't think you have an internal speaker, but yes you can certainly still have two-way communication with Natto. Your communication is conducted via your commlink. Because yours is internal, you'll need the information sent to you displayed in some other way (external commlinks can be visually read or aurally heard). That's where your sim module, which is part of your internal control rig, comes in. It converts the information into simsense perceivable information. This appears how you choose it to appear, eg as an AR or VR display, typically via what you 'see' or 'hear'. In return, you interface with that. Because your direct neural interface (DNI) is also internal, you can simply think your thoughts, and they get projected through that sim interface as if it were speech, then the module sends the information through your commlink, then finally out.

Forgot to mention your Perception test earlier was a glitch, although I've noted that your Clearsight roll has 4 successes. That means the data has been collected by you, and also presumably by Natto. But Hotaru overall Perception, even with that roll, fails, and furthermore might have the opposite effect. I'll let you know what opposite effect might happen, soon... :)

Yea, almost a critical glitche with 13 dice... thats a bit weird :X

Just to clarify further how I understand the olfactory sensor to work, p283. Mechanically, all it does game-wise is give Edge to scent-based Perception tests. It is essentially a Perception test, p97, so like one, what it does is to give a chance to smell anything that's hidden from sight or hearing. It allows you to smell sweat, perfume, ammo, drugs, etc. So when you get your drone to roll a Perception test, what you're really doing is asking the drone to transmit all olfactory sensory data to you for you to figure out if there's anything that smells out of the ordinary, eg that person is carrying a weapon, or this person is sweating profusely because he's nervous, etc. It's like a Perception roll based on sight or hearing, eg that person is looking around suspiciously, this person is trying to hide behind a pillar, etc.
The range of an olfactory sensor is a particular radius (how far can the sensor 'smell'), just like a visual sensor has a radius (as far as eyes, or vision enhancers, can see).
Secondly, when you say you're comparing old recordings to new recordings, I'm not sure what information you want. Using visual recordings as an analogy, if it were visual, I take it to mean that comparing old and new means say, you've recorded half an hour of a visual feed, and you're comparing all the recorded information to see what the differences are in the last half hour, ie. how many people walked past, who spoke to whom, who sat where, etc. If so, then a half hour of olfactory recording means you've recorded how each person smelled for that half hour, whether smells have moved around because a person with perfume walked past, etc. The old and new data you mentioned is not just two pieces of information, but the entire recording's worth of information. (Reviewing long durations of information also takes time, I might require Extended tests).
Or did you simply mean you recorded the dwarf and the bodyguard, the female shadowrunner, etc earlier, and just want to check if you can 'smell' them in the carriage? (It's the same for visual Perception: you saw a man in a black hat earlier, now you want to see if you can spot if he followed you.)
Sorry for the long-winded question, I just wanted to make sure I'm giving you the information you want based on your rolls.

I simply mean that, if a specific person or smell was detected in the first train is noticed again in the second, it would be a great clue that could lead to find who or what is following him.

Also, with Hotaru's stats and speed, I would expect him to proceed that kind of information much more rapidly that the average person. Especially if he focuses only on the data that is present in both trains only.

Sure thing! If I need an Extended test, your speed will be taken into account to determine the Interval between each test.

Rolling the pattern recognition part of the perception skill, possibly as an extended test

I see 6 successes on the Perception test. This means Hotaru can figure out a number of things. The above is literally what he pieces together. I'll give you a chance to decide if you want to do anything in response to it before I proceed further.