Data Logging and / or Telemetry ?

[solentlife]

I've been using various Doppler speed programs to evaluate model performance ... but they all lack in terms of slower models and when wind noise / other sounds enter the recording.

I use FrSky radio modules and am thinking to change to Two-Way telemetry from the standard one-way in use now.

Main information I'm looking for is track / speed / altitude info.

I would think that a data logger recording info in flight is easiest way to go ... but probably more cost and heavier than telemetry. But it gives the possibility of PC download after for analysis.

I need advice / info on what people use and how to achieve it in lightest, smallest, most economic way .....

At present I am leaning towards FrSky two-way module, Rx, hub, GPS sensor, data display.

Does the GPS sensor and data display give tracked flight ? can it record to view later ?

?????

[solentlife]

OK ... USA guy I chat with gave me this link :

http://eagletreesystems.com/Support/manu...eed-v3.pdf

Tiny, light, easy to fit, standalone or with logger / PC