In the Gen II there were 3 speed settings for up to 3 users. Useful for the Nav system to gauge time to destination. I can't find that in my Prime, does it or something similar exist?
Mine seems to predict arrival times by what it thinks the speed limits are and uses those. Reason I come to this conclusion is if I drive higher than the posted limit the arrival time decreases and if I drive slower than the posted limit the arrival times increase.
I am not a frequent user of in car NAV, but I just traveled down to Boston area and needed to use the NAV. We had stand alone Garmin with us, but I forgot to bring the stand/holder for it, thus, I was forced to use in car NAV when I was driving alone. Anyway, I never saw speed setting for NAV in PRIME. I don't think Garmin has that feature either. As @schja01 eluded, both Toyota's in car NAV in PRIME and current Garmin system use speed limit AND traffic condition to estimate the arrival time. Incidentally, both systems displayed fairly similar ETA when I encountered some delay due to heavy traffic.
That's because our old nav didn't have speed limit data embedded in the map - just road type. The new map data/nav has speed limit data so it can better estimate ETA. (I can't remember if it also uses traffic data)
I believe it does. I've been stuck in traffic and have watch the ETA go up. kind of disheartening really
I've been thinking about this. If the original ETA did NOT use traffic info then the ETA would go up any time you are stopped. If the original ETA DID use traffic info (and it was accurate) then the ETA should remain pretty much the same. Right?
That should be easy to test, especially at your local. Try using NAV for the same destination on the same route to travel but at different time of the day, say during rush hour and at late night. If the traffic information is being considered for the ETA, the rush hour ETA should be substantially longer from the start. You don't even have to travel. Just enter the destination from the same starting point like your home at different time. Unfortunately, I will not be able get much difference in travel time around where I live unless there is a major car accident or weather issue.
I guess they ASSUME everyone follows the speed limit. If I'm not in a hurry and there isn't traffic I will go 55 MPH, saves gas. I had one set for highway at 55, one at 60 and one at 65. Useful for those 200 mile trips to MA. And their assumption is only as good as the data (I have already found places where it is wrong) .... and if people pay the $$ to update their maps. Which I never did because you don't know what changed and it was like $250 for something they could make for $10. I bet they could make money on map updates if they charged what it actually cost to make plus 10%. Lots more people would fork over.
Sorry, of course, I should have been more clear. I seem to recall the ETA going up far quicker than my stopped time (e.g. I was stopped for 5 minutes but the ETA went up by a 1/2 hour, not the length of time I was stopped).
