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Garmin Nuvi 2465 - Possible To Change Average Speeds Used In Eta Calculation?

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My Garmin Nuvi 2465 is excellent at navigation, but its assumptions of average speeds in Bangkok are ridiculously high. I can't find anywhere in the settings where I can change them - am I missing something?

This has two annoying consequences - firstly the predicted journey time is wildly underestimated and secondly the route selections are heavily biased towards the shortest distance rather than the shortest time. I have set the option to pick the route with fastest time, but the speed estimates are so wrong that this has no effect.

For example, I did a trip today from Bangna to Ratchapruek Road. The way I would do this is to get on Route 9, the outer ring road and drive round the outside of Bangkok. The Nuvi plots basically a straight line through the middle of Bangkok via Srinakarin, Rama 9 amd the Krung Thon bridge. It correctly measures the distance as 36km, but estimates the journey time as 35 minutes, i.e. it assumes an average speed of 60kmh through the middle of Bangkok! I followed the suggested route and it actually took 1h45m with an average speed of 20kmh. The traffic was not too bad, in rush hour or if it were raining I could easily envisage the journey taking three hours. I returned via the ring road taking 56 minutes to do 62km at an average of 65kmh.

Is there any way I can tell it to use, say, 15kmh as the average speed in the city?

There is no way any GPS device can work out an accurate ETA in BKK traffic conditions without receiving accurate external information about traffic conditions on your route. As far as I know, none exist.

On a Nuvi you can change that field to show KM's remaining instead. Then judge the remaining time by yourself. I think that's the best you can do.

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