lost time

You don't need to convert. When you enter an address and it shows up on the map, the coords are indicated above the map, right underneath the icons Must be a setup thing because I don't get that.

It is your car's speedo that is "fairly accurate", in fact very accurate for a car. The GPS is likely much closer, and certainly gives more than a general idea of speed. This thread got me to do a bit more checking and they are typically rated at around +/- 0.1 knots (roughly mph). I dare say that's plenty accurate for most things. As already mentioned, it may be accurate but not have suitable functionality.

I'm no expert, but I don't think that bit of “common knowledge” is correct even though it certainly is a logical guess. As I understand it, they calculate the Doppler shift in the carrier signals coming from each satellite. Assuming that's the norm and not just ultra-expensive aviation units, then your GPS is probably more accurate than any other method at your disposal, and certainly more accurate than automotive speedometers. Try holding your speed constant on a long straight stretch of road and you will see that at a minimum your GPS yields very consistent and repeatable readings, and I suspect very accurate. Edit: Garmin 60CS claims accuracy of 0.05 m/sec, which would be abut 1.7 inches per second. So unless your rowing team is REALLY slow, I think a GPS might be just the ticket.

So, from those who have used both older and newer units, how much accuracy does WAAS really add? I'm still using an old Eagle 100, which IMO was one of the best values of that generation. Having read the above and some other threads it seems that I'm already getting as close as most and closer than many. BTW, I experienced some wild fluctuations last Saturday as well.