Microlab PRO-1 User Manual download pdf (Page 59)

GPX Pro 54

sessions. Only that one session is deleted.

Delete all sessions - deletes all Drag mode races.

1.9.11 Other Notes

The maximum lap or race time displayed is 9 hours, 59 minutes, 59 seconds. The display will

“freeze” at that point if the lap time exceeds that time.

In circuit mode, if you have the GPX turned on in your car, for example, when just driving

somewhere, once you hit the “starting speed”, it will think you are racing and begin looking for a

track or loop. The GPX will actually start storing data, but that data will be automatically deleted

when you go less than “stopping speed”, or if you travel more than 15 miles.

1.10 Introduction to GPS

The Global Positioning System consists of a constellation of satellites orbiting the earth. There

are currently 24+ such satellites in orbit. It is commonly thought that the satellites are stationary

in the sky (“geostationary”) like DirecTV or DishNetwork satellites, but this is not the case. The

satellites are constantly in motion – if they were not, there could be places on earth (imagine a

“canyon” in New York City) where reception could be essentially permanently blocked. Since

they are moving, any “outage” would only last for a little while.

If you are in a big open field, up to 12 satellites should be “in view” at any time. Depending on

cloud cover, atmospheric conditions, etc., less than 12 satellites may be “in view”. On the main

screen of the GPX, the number of satellites in view, and the relative “quality of signal” is

displayed. You may find that positioning the GPX in a different spot on your vehicle may have an

effect on signal quality. Generally, the more “open” the GPX is to the sky, the better the

reception.

Also, as a result of the constant motion of the GPS satellites, you may find that, at the same track,

on different days, or even within the same day, you may find significant differences in the quality

of signal.

The GPX uses a sensitive internal antenna (mounted inside the GPX enclosure) as standard. If you

wish to improve your GPS signal quality pick-up, you may order an auxillary external antenna with

magnetic mount which can be positioned up to 10 feet from the GPX unit, for improved reception

(for example, it may be mounted on the roof of a racing car, or on the tail section of a

motorcycle).

The GPX requires a minimum quality of GPS signal before it can be used. It must have at least 4

satellites in view, and the EHPE (estimated horizontal position error) must be less than 5.00.

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Microlab PRO-1 User Manual Page 59