Can't find correct format
> They are using one like this: 4894498.69 N, 488808.43 E
The maps are using this format? Sounds like UTM (but missing the UTM zone). As GOF says, go read the Garmin manual; the manual is (for once) fairly clear on how to set datum and coordinate displays.
BTW, this is predominantly a UK-based site, so its members probably aren't too familiar with US mapping... There are some US-based members, though.
Like the captain says it sounds like your projection is UTM.
For the datum: If it's a reasonably up to date map try using NAD83; otherwise if it's a older (pre-GPS era) map then you could try NAD27.
In either case, the geodetic information should be shown somewhere on the legend/map border. You'e looking for a 'Datum' (WGS84, NAD83, OSGB etc.) which is the reference point for 0E 0N, and a 'Projection' (UTM, MGRS, British Grid etc.) which is how a lat/long is converted to a easting/northing.
You'e looking for a 'Datum' (WGS84, NAD83, OSGB etc.) which is the reference point for 0E 0N
The datum also includes the local spheroid in use; WGS84 uses a global spheroid model. OSGB36 uses the Airy spheroid, which is more accurate for GB. I'm sure NAD83 includes a spheroid model which is more accurate for North America.
The reference isn't necessarily 0E 0N, but is appropriate to the local datum and projection.
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