Navi Data Chip

A Navi Data Chip (ナビデータチップ) is a toy Battle Chip used in the Rockman.EXE series.

In the games
In Rockman EXE 4.5 Real Operation, Advanced PET Navi Data Chips unlock the Navi depicted on the chip as a playable character on the player select screen. There are 21 characters that can be unlocked.

In Rockman.EXE 5 and 6, when Netto Hikari is operating a NetNavi other than Rockman.EXE, he has the option of selecting a fixed Navi Data Chip. This chip can only be used once per battle, and it is the NetNavi's most powerful attack.

Toy versions
With the release of the Battle Chip Gate products, Navi Data Chips were released to allow the player to play as the NetNavi represented in the chip throughout the game by slotting in any of these chips in the Battle Chip Gate.

It first appeared in the Japanese version of Rockman.EXE. 4 as a Operation Battle secret mode that becomes available with the Battle Chip Gate, and as a major feature in Rockman.EXE 4.5 Real Operation. While the Battle Chip Gate wasn't released outside Japan, the mode is still present in the fourth game and can be unlocked in any version. Most Navi Data Chips were released in Operation Battle Starter boxes containing 8 Standard Chips, 1 Mega Chip, and 1 Navi Data Chip.

For Rockman.EXE 5, Navi Data Chips returned, but had a slightly different purpose. Slotting in a Navi Chip in the overworld allows the player to switch Navis for as long as the player wishes. Slotting in Navi Chips in the net or in a Net Battle would allow MegaMan to gain the Navi's Double Soul, even if the player hasn't unlocked that Navi's Soul yet. Interestingly, this will not change any conversation sequences in the game.

Navi Data Chips were also released for Rockman.EXE 6 and Rockman.EXE Battle Chip Stadium.