This affordable unit is very simple to use and allows me to catch the maximum speed of my models without any modification on them, except running them with 150 extra grams.

It's completely waterproof

It only requires to keep a direction for about 30m at full speed on a open area... Mine was ordered directly from an US merchant for 120US$ in 2002

See there for ETREX product information

For now prefer newer units from Garmin (Gecko ...) for Remote motorsport use

The Garmin allows me to check the actual max speed of my car prototypes and the same for my FE boats ...

Please protect the GPS carefully when equipping a car, as right installation

Recording max speed requires optimal receiving conditions so cars must be ran straight forward on a large opened space

The E-ven and the TGX-Neo were recorded at 57km/h and 69km/h on open roads while spectators though they were near 100km/h ... See E-ven videos to feel what this actual speed is about

You now understand why I hate forum kids that claim big speeds w/o any measure ...

GPS average speed vs Radar gun PEAK speed

RADAR speed measure of Boats CANNOT be compared to GPS measure

At left, my Gancia dei Gancia shows you a typical case

Measuring its max speed with an onboard GPS actually reveals a "max average speed" between 2 satellite check-points. Say at every 10 meters ...

Radar gun for its own measures an "instant peak speed" by direct refraction somewhere on the hull at hi frequency

As a result with such a non-continuous motion, Radar measure is more optimistic than the GPS one

Here, the Radar will catch the peak speed of the Gancia on the left attitude (highest thrust/drag point) meanwhile the GPS will record its average speed between 2 distant locations

Despite the common preference for Radar, I personnaly prefer the GPS method because it's the only one to tell you the actual speed on a travel, and not only a sudden peak speed

Both methods allow people to compare their models so go for the one other people use and don't be fooled by people telling you they radared their models at 50km/h while you GPSed yours at 45km/h : Their models aren't necessary faster than yours !!

 

Trip record

GPS records also your model trip

A GPS can also help you know what distance traveled your model during its run

A way to analyse its actual endurance and what space it actually used on air

I didn't use yet this capability for my airplanes but it already helped me know what straights I actually did with my Gancia during its runs

Any GPS will tell you if you kept your airplane inside the flight area allowed by your local field. A true 3D GPS will also tell you exactly its trajectory !

Unfortunately entry-level GPS like the E-Trex don't record accurately the altitude. Anyway you can download its data on your PC to have an idea of it

At last, remembr that GPS can help you mark the area where your lost plane is in order to come back later with all the stuff to rescue it ...

 

 

rcsaga.com Speed Verdict ring !

 GPS

 Gear ratio analysis

Tachymeter