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speed spikes with navi

Is it normal to get speed spikes, I seem to everytime I use my navi, I have the latest firmware installed from Mt Best and use Realspeed 1.92. some are easy to spot and I just delete that run in the lower window of Realspeed and let it recalulate my data. Is that what I'm supposed to do? Others are not so clear cut for instance yesterdays Breakwater to Beacon race the navi showed a max speed of 22.45 but realspeed showed up 2 max 2 sec 1 at 27.17 and 1 at 24.05 What is the general rule when analizing and deleting the data. Ive started uploading onto the GPSSS site so I would like to think my data is accurate, not that I am going to break any records

I apologise if this has been covered before.

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This graph perfectly illustrates the value of having the Doppler speed from a GPS as well as the track points. In this case the track points have been affected by a spike and give a highly inflated speed. We can prove this has happened because the Doppler differs and remains at the speed we would expect at that time and place. Doppler is not affected by locational calculation errors.