I decided that I would like some indicators, firstly to make it easier to see the bird when it gets a few hundred feet away, and also to allow me to see it's orientation when the fpv is misbehaving. Since we use high brightness LEDs for signs & displays, I put a red one facing forward, and a green one facing back, both shining horizontally, and connected to the battery connector in series with a 1k resistor so that they are on whenever the power is on. Total current draw is about 7ma. Yawing the bird gives a green or red flash, depending which is towards me. The leds are 15 deg water-clear 5000mc. The green is more noticeable than the red. I just went for a fly, and I could see them easily at 1000 ft distance/ 20 ft altitude over the harbour here. It sure makes it much easier to spot against the background.