Park at Q743 107 A, where the narrow road turns to the left, beside a nearby a house, and where there is just room for a couple of cars. Head up the track at the side of the house and you will reach a stile which leads onto the open mountain. Follow a faint path to the right of the gorge of the Derrymore River, until you reach Derrymore Lough high up in the glen. Turn NW for about 700m, the ground becoming increasingly steep as you near the summit, but mostly firm underfoot. It eventually eases up at about 760m ascent. The summit is a long narrow mound covered in grass and rocks, otherwise unmarked. Time to reach summit, approximately 2 hours. Linkback: https://mountainviews.ie/summit/47/comment/4807/

I took this photo on the ridge between Caherconree and Gearhane.
The sandstone conglomerate formations in the foreground are quite striking in appearance. Behind is the rocky summit area of Gearhane. Linkback: https://mountainviews.ie/summit/47/comment/2153/

It's a long, joint-mangling descent from Gearhane to the foot of the Derrymore Glen; in retrospect, it's probably better to do Bautregaum to Gearhane in the other direction, and then descend the glen. Either way, a beautiful walk on a clear day. Linkback: https://mountainviews.ie/summit/47/comment/2825/

An excellent point to start for much of the southern Slieve Mish area is at Q74224 10770 B. Going west out of Tralee on the N86 after about 11k you encounter a hump-backed bridge ("Derrymore Bridge"). Turn left shortly afterwards into a fairly narrow road which you can follow until it ends. There's a limited amount of parking here. Go past a pebble dashed house and there is path leading to open land.

Once there Gearhane is directly ahead. It's a steep pull up, slightly easier to the left as you face it (the NE ridge).

As you rise you can get glimpses of the Derrymore valley and a good view of the graceful conical Barrtregaum NW summit. Gearhane becomes a narrow North South ridge around 800m long. The summit itself has a few outcrops, one of which has a small cairn beside it which is probably the highest point. On a good day, views open out right down the Dingle peninsula and to the north Kerry coast.

There is another Gearhane on the Dingle peninsula just south of Brandon of 803m.
Out of curiousity I wondered is it possible to see the other from here. The other is 26.6km west, however Beenoskee is in the way, (16km away).. The top of Beenoskee at 826m is higher than either Gearhane. According to my measurements you would be able to see one from the other, because the line of sight goes slightly south of the summit of Beenoskee at a point where it is around 700m high. Perhaps someone can oblige with a photo! Linkback: https://mountainviews.ie/summit/47/comment/2030/

Excellent views down to the bay and well worth taking the slight detour while doing the Caherconree - Bautreggaum horseshoe. Very easy saddle between that and Caherconree. Linkback: https://mountainviews.ie/summit/47/comment/1500/

In response to Simon's query regarding photos of Gearhane/Brandon Group from Gearhane/Slieve Mish I took this photo on a smashing August Sunday. Whilst it does not give the actual view Westward from Gearhane/SM it gives the view over Gearhane ridge and towards the Brandon Group. If I am not mistaken you can spot Brandon to the right, Brandon Peak and Gearhane/BG in the distance. From this perspective I would say that a similar view should be possible from Gearhane/SM. I will stand corrected on this of course! Linkback: https://mountainviews.ie/summit/47/comment/6016/