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I read the other question posted as possibly similar but it doesn't address the airgapped computer aspect of my question

An air-gapped computer cold signs. That's the point here.

Can the Monero GUI run in an airgapped computer without connecting to the network?

Yes. This is cold signing. Cold as in "not connected to the internet".

From what I understand, all three modes (Simple, Simple+Bootstrap, and Advanced) need to connect to the network.

No. The official wallets (GUI and command-line), both support cold signing transactions. In the GUI version, you have to use the wallet in "advanced" mode. They do not need to be connected to the internet/network to do this.

Annotating/expanding the duplicate questions answer for you:

First create your offline cold wallet, in the GUI, on your offline (air-gapped) computer. Use "advanced mode". Cold-signing transactions is after all an "advanced" thing to be doing.

  1. Create a view only wallet (settings page)

You do this on your offline (air-gapped) computer.

  1. Open view wallet and create a transfer, save with "Save tx" button

You do this on your online computer.

  1. In original wallet, click "Sign tx" on send page and select the file

You do this on your offline (air-gapped) computer.

  1. in view wallet, click "Submit tx" and select the signed tx file

You do this on your online computer.

I read the other question posted as possibly similar but it doesn't address the airgapped computer aspect of my question

An air-gapped computer cold signs. That's the point here.

Can the Monero GUI run in an airgapped computer without connecting to the network?

Yes. This is cold signing. Cold as in "not connected to the internet".

From what I understand, all three modes (Simple, Simple+Bootstrap, and Advanced) need to connect to the network.

No. The official wallets (GUI and command-line), both support cold signing transactions. In the GUI version, you have to use the wallet in "advanced" mode.

Annotating/expanding the duplicate questions answer for you:

First create your offline cold wallet, in the GUI, on your offline (air-gapped) computer. Use "advanced mode". Cold-signing transactions is after all an "advanced" thing to be doing.

  1. Create a view only wallet (settings page)

You do this on your offline (air-gapped) computer.

  1. Open view wallet and create a transfer, save with "Save tx" button

You do this on your online computer.

  1. In original wallet, click "Sign tx" on send page and select the file

You do this on your offline (air-gapped) computer.

  1. in view wallet, click "Submit tx" and select the signed tx file

You do this on your online computer.

I read the other question posted as possibly similar but it doesn't address the airgapped computer aspect of my question

An air-gapped computer cold signs. That's the point here.

Can the Monero GUI run in an airgapped computer without connecting to the network?

Yes. This is cold signing. Cold as in "not connected to the internet".

From what I understand, all three modes (Simple, Simple+Bootstrap, and Advanced) need to connect to the network.

No. The official wallets (GUI and command-line), both support cold signing transactions. In the GUI version, you have to use the wallet in "advanced" mode. They do not need to be connected to the internet/network to do this.

Annotating/expanding the duplicate questions answer for you:

First create your offline cold wallet, in the GUI, on your offline (air-gapped) computer. Use "advanced mode". Cold-signing transactions is after all an "advanced" thing to be doing.

  1. Create a view only wallet (settings page)

You do this on your offline (air-gapped) computer.

  1. Open view wallet and create a transfer, save with "Save tx" button

You do this on your online computer.

  1. In original wallet, click "Sign tx" on send page and select the file

You do this on your offline (air-gapped) computer.

  1. in view wallet, click "Submit tx" and select the signed tx file

You do this on your online computer.

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source | link

I read the other question posted as possibly similar but it doesn't address the airgapped computer aspect of my question

An air-gapped computer cold signs. That's the point here.

Can the Monero GUI run in an airgapped computer without connecting to the network?

Yes. This is cold signing. Cold as in "not connected to the internet".

From what I understand, all three modes (Simple, Simple+Bootstrap, and Advanced) need to connect to the network.

No. The official wallets (GUI and command-line), both support cold signing transactions. In the GUI version, you have to use the wallet in "advanced" mode.

Annotating/expanding the duplicate questions answer for you:

First create your offline cold wallet, in the GUI, on your offline (air-gapped) computer. Use "advanced mode". Cold-signing transactions is after all an "advanced" thing to be doing.

  1. Create a view only wallet (settings page)

You do this on your offline (air-gapped) computer.

  1. Open view wallet and create a transfer, save with "Save tx" button

You do this on your online computer.

  1. In original wallet, click "Sign tx" on send page and select the file

You do this on your offline (air-gapped) computer.

  1. in view wallet, click "Submit tx" and select the signed tx file

You do this on your online computer.