For Garmin official maps, if it depends on use of their newer NT format mapping, it's correct to say that it's outdated or obsolete.

Some devices from mid-decade 2000's can indeed use the New Technology format due to firmware capability and are not limited to using the original format (known as 'non-NT'). That earlier format data ceased being issued by Garmin in ~2009.

It also doesn't have the capacity to use all of the current GNSS satellites.

Regardless, even though it might not be capable of displaying Garmin's NT maps like the StreetPilot III it is based upon, it can be made usable and accurate enough in EU by using OpenStreet maps which are fine for a device that cannot use Garmin's 'eye-candy' stuff such as JunctionView or Lane Assist anyway. It will of course be limited to GPS satellites not GLONASS/Galileo, but the original GPS signals are fine worldwide anyway. In Australia we still use GPS exclusively even for aviation navigation. Farmers here get accuracy down to inches in remote rural areas for GPS-equipped tractors and harvesters.

If you'd like to experiment further with it i'm quite happy to spend the time to establish what it can and can't do as far as maps are concerned. I have a similar device from the same era also based on the SP III which i can use to help too:
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