![]() If you were going 120 KTS, your descent rate should increase to approximately 600 fpm. For example, if your ground speed is 90 KTS, dividing by 2 equals 45, add a 0 to the end a descent rate of 450 fpm. Traffic movement based on distance + speed is a very rough estimate at best, so your estimates on bus arrival times will be not much more accurate than the official time tables. How to calculate descent rate: A quick method to calculate rate of descent is to take your ground speed, and divide it in half, then add a zero. Furthermore, estimated time of arrival (as displayed at bus stops) is constantly updated based on actual traffic conditions - so if you see the next bus is due in 5 minutes, it may change to 6 or 7, or suddenly jump to 3. Time spent at stops in rush hour is also much longer (more passengers to board - just the boarding may take 5 minutes - or having to wait for other buses occupying the same stop). So in rush hour you can see longer time between two stops than at other hours (and with traffic jams being pretty reliable, those times are also quite reliable). Call this API in the language of your choice through one of the. ![]() If you are using an external NMEA format data source, this is the HDOP. You can use this data to calculate travel distance and time. With the right technology in place, it is extremely accurate. Accuracy: Some measure of how accurate the GPS fix is. Over time they just logged how long it takes a bus to move between stops. The location of an item, the speed of an item, and timing. Our local bus companies do it based on old data, not on actual distances.
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