This is a dinosaur you have, uses the old Garmin Data Card.
Unfortunately that old beast has a card size limit of 128MB, which is near useless with any topo mapping.
Since you don't even have a card & the cost of them being prohibitive, $130 second hand refurbished with bluechart maps.
I would think you would be better off getting a new or second hand GPS or a smart phone & load the appropriate mapping you want to the new device.
Maybe Surething has some intel he can share that may help.
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