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Why use Reach as the secondary GPS in a pixhawk build

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@nijoe wrote:

Before creating a new thread please refer to Quickstart guides for Reach and Reach RS.

In case you are creating a thread about an issue it is necessary to provide following information to get help:

  1. Firmware image and ReachView version.
  2. System report.
  3. Detailed problem description. How does observed behavior differ from the expected one?
  4. Your step by step actions.
  5. Picture of the setup and connection scheme.
  6. Specify the exact make and model of the hardware you are integrating.

I am putting together an autonomous boat using ArduRover. I am using a Pixhawk 2.4.8 as the flight controller. The online docs recommend using your Reach as the secondary GPS. I find this surprising, using a rather expensive Reach as a secondary unit and (probably) much cheaper gps as the primary! What’s the reasoning behind this? I plan on using a second Reach to send RTK corrections to the boat.

Can I use onboard Reach as my primary GPS without any secondary? If so, how does this impact installation? Do I still need to connect the Reach to the pixhawk’s serial port?

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