Should I wait for fenix 7 or go with 6? Thx

robm said:

New Marq already announced and has a tempe sensor

You are talking about, that they are delivered with an addidional external Garmin tempe sensor, correct?

The external thermometer Tempe is not new, I have one since 6 years. It is a great toy and I like to measure the temperature variations during a run. The temperature should only affect VO2max when it is very warm and your heart rate is increased because of that.

Hm.. just the possibility that I was first to have a precise look at both the Fenix 6 Corning and the FR945 side-by-side and definitely saw the difference of the amount of reflection (and the bluish tint of the lesser reflection of the FR945 which is knwon by a/r-coated glasses) doesn´t eliminate facts, does it?

Much much better than just doubt something without having seen it, is rather to check it on your own. It's easy enough for everyone to go into a shop and check (if it provides the models) Otherwise there is no point in just questioning anyone's findings. 

Wait Fenix 7. maybe it's will have normal gps-track. because, Fenix 6 have terrible gps

I have 3 Tempes, and at the beginning also I liked them. But honestly speaking as regards accuracy they fail even in the lightest direct sunlight. For the time being I put all of them on my running shoes, trekking boots and cycling shoes lacing them to the top, in order to place them as far as I can from my body radiating thermal energy.

Earlier I tried to put one Tempe under the frame of my road bike as an experiment to improve its accuracy, but since the  metal frame collected the thermal energy it overestimated the temperature, too.

If Garmin were wise it would have Tempe manufactured from white plastic instead of black to decrease the bias coming from direct sunlight.  But I am quite sure they should be manufactured from some special material with a very low thermal conductive capacity (sorry if it is not the right English term for it) in order to get a decent number on cloudless days. Or maybe in a miniaturized Stevenson screen.

I know, I know, I know... you are about to say that if I were wise I would ruń, hike and cycle with an umbrella in my hand. :-)

Nicely written. In this forum the fanboys beware Garmin from having made any mistakes. For them its all about the stupid customer beeing far to critical with the products :-)

Tisztul_A_Visztula said:

If Garmin were wise it would have Tempe manufactured from white plastic instead of black to decrease the bias coming from direct sunlight.  But I am quite sure they should be manufactured from some special material with a very low thermal conductive capacity

Actually- white (or silver) would be a good idea.  Of course- if it were a case with low thermal conductivity, then the temp sensor would in essence be insulated from the air, and be slow to respond to changes.  Or, perhaps a positive way to look at it is- that the Tempe sensor doesn't measure the air temp, but rather the environment including the solar thermal load. Which frankly may be a more useful metric?  "It's not a bug, it's a feature!"

Direct sunlight influences temperature measurements, that's physics and you blame Garmin for that? A different surface would make the effect smaller or larger, but the values would still be influenced. O.k. were are in the post-factural age driven by alternative facts, but for me as a scientist those discussions are weird!

I mounted one tempe on top of the seatpost so that it's normally in the shadow of the saddle. For running I mount it on the shoe and then it's clear that the values are too high in the sun.

Is it weird? As a scientist do you think that swapping the case from black to white would have a minimal effect on the distortion?

Because I dont blame physics, but Garmin for not trying to minimize the unwanted effects. Plastic change would not cost so much, would it?

Anyway thank you for your hint regarding the seatpost.