Glad to try. The marker is used to align the main and bandspread dials
and thereby give tuning accuracy around 5khz. The bandspread dial is
most useful with ssb stations and locking in the frequency an am
station is broadcasting on. For casual broadcast band scanning the
main tuning dial is sufficient.

The marker generates a tone when both dials are tuned to the same
place. To use it you set the bandspread to the beginning of the band
in question then tune around the same location with the main tuning
dial until you peak the tone. When you change bands, just repeat the
process.

For bands not shown on the bandspread dial you can use the dial as a
fine tuning control or use the 0 to 100 scale.

The owners manual has a very good explanation. Be sure and post your
impressions once you get the receiver.